Task: Instance Class Understanding (ontology: Sciences/Biology)

Which of the following classes does 'inversione sessuale' belong to as one valid explicit type? Context: The usage of "sexual inversion" in the late 19th and early 20th century by sexologists was relatively imprecise, and could have referred to individuals considered gay or transgender (or both) today. This lack of clarity may have, in part, contributed to contemporary confusion between being transgender and being gay.

A. audio recording
B. legal term
C. obsolete legal term
D. obsolete medical term

Answer: obsolete medical term