Proceed through the door

You follow her direction into a white clinical looking room, a dentists style chair with the capacity to recline dominates the room and demands your attention at first. It's currently sat upright facing away from you and towards a desk. There's an office chair behind the fairly nondescript desk, long enough for both the computer it has on it and a section at a right angle that's open, that part of the desk comes between the two chairs. You guess so the doctor can talk to the test subject. You have a while to just look around the room while it sits empty though and you start to wonder if you should take a seat. As you start to take a step though the choice is taken away from you as the second door opens and in walks a researcher.

"Good morning, I'm Dr. Black." She's wearing a labcoat over a short floral print summer dress, her blonde hair stops just above her shoulders in a professional style but she's younger than you expected, late 20s maybe. Her accent strikes you as eastern European but not Polish so you're out of luck in terms of placing it. She's a little shorter than you, even with her short heels and she has a nice figure, you're distracted for a moment by the curve of her waist to her hips which seems to if anything be accentuated by the labcoat hanging loose at her sides until it reaches her hips.

"If you're done with your assessment we'll start mine?" You blink your eyes back to her face, embarrassed, but she seems to be smirking slightly at you. "I can see why they thought you'd make a good candidate." She says opaquely. As she opens and starts to read through a folder she brought in with her she gestures at a corner of the room. "Just drop your clothes off over there."
"Oh uh... all of them?" Your shirt comes off for a lot of studies but this would be a first...
She looks back up at you, frowning slightly, "Yes, obviously, you did read the consent form yes?" Caught out you nod, hopefully convincingly, and start to strip, your shirt, shoes, socks and trousers dropped into the indicated corner. As you play with the waistband of your boxers you look back to Dr. Black. She's half reading the document but her eyes keep flicking back up to watch you. The subtle grin suggests to you she's enjoying herself maybe to a slightly unprofessional level. You shrug to yourself and pull off the last of your clothes trying not to think about the beautiful doctor looking at you, in case other parts of your body start to give any visible sign.

She speaks as soon as your boxers join the pile, no pretense that she hadn't been watching you. "Take a seat," she gestures to the imposing chair with the wipe clean material. Good, if the last person here was also naked, but it looks like the material might be sticky on bare skin. Still, money is money and you've done worse. You take your seat, sliding in inelegantly from the side as it's the style which raises your legs out in front of you, meaning you can't sit down directly. It's not as uncomfortable as you thought it'd be, it's not great but at least it doesn't feel cold.

Dr. Black drops her folder on the desk and walks around it to stand beside you. She slides forward a small table that's attached to the chair so it's in front of you. It seems like the little sinks you've seen in dentists chairs but this one is just a plain surface. She reaches into her lab coat pockets and pulls out two vials, one mostly full of pink pills and the other contaning just a few green pills. She delicately opens each of them and you watch her thin fingers and manicured nails perform the repeated action to twist off the lids. She places one pink pill on the table to your left and one green pill on the table to your right. She gestures to the pink pill first. "As a reminder of the study content, this is medication A," her hand moves to point to the green pill, "and this is medication B, you may choose whichever you wish." She turns to her desk and opens a drawer and pulls out a bottle of water, placing it on the table between the pills. "Now is also a good time to ask any last questions if you have them." She smiles at you, seeming much more open to talk than her assistant has been. And you resign yourself to talking to her while naked, but it really feels like some of this talking could have been done before your clothes came off.