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

Which of the following classes is one valid superclass of 'mole'?

A. ectoderm-derived structure
B. B-1 B cell differentiation
C. ({[(2R,3S,4R,5R)-3,4-dihydroxy-5-(9H-purin-9-yl)oxolan-2-yl]methyl phosphonato}oxy)(phosphonatooxy)phosphinate
D. 2nd arch endoderm

Answer: ectoderm-derived structure