Mixed breed (you're just lazy)

Just like the famed Little Mermaid from a famous land-dwelling author, the generations of interspecies intercourse - so common among the the Merfolk and the fishy variety in particular - has resulted in the sublime but unspecified specimen that is yourself!

"Now then, one final question. As you well know Merfolk torsos are different from those of sea creatures, and resemble more those of land dwellers.What kind of torso do you identify yourself as having? asks the turtle merman gently.

You wonder why he can't use his own eyes to identify you. Seeming to guess your thoughts the elderly merman responds to your unspoken question.

"This is a required question, in order to prevent any biases on the part of the registration clerk."