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

Which of the following definitions best describes 'set of heterogeneous anatomical structures'?

A. A system of glands that secrete fluids delivered via ducts and tubes directly to organs including the skin.
B. A part of the system of genitalia.
C. Collective designation for those tissues capable of secreting hormones.
D. Anatomical set which has as its direct members, organs, organ parts and tissues of same or different types.

Answer: Anatomical set which has as its direct members, organs, organ parts and tissues of same or different types.