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

Which of the following definitions best describes the instance 'ménage à trois'?

A. A term that was first used by Henry L. Kazal and colleagues in 1976 to describe various sexually transmitted rectal infections seen in Kazal's proctology practice, which had many gay patients. The term is considered obsolete as the issues it describes are not gay-specific, confined to the bowel, nor a syndrome. In 2005, the U.S. Centers for Disease Control described the term as informal and no longer in use.
B. An argot used by gay people of South Africa and Zimbabwe who speak Bantu languages.
C. A term used to refer to either a romantic rivalry involving three people (a love triangle), sexual activity involving three persons simultaneously (a threesome), or a domestic arrangement with three people sharing sexual and romantic relations as a form of polyamory (known as a throuple, thruple, or triad).
D. An outdated term referring to a person who is transsexual.

Answer: A term used to refer to either a romantic rivalry involving three people (a love triangle), sexual activity involving three persons simultaneously (a threesome), or a domestic arrangement with three people sharing sexual and romantic relations as a form of polyamory (known as a throuple, thruple, or triad).