Task: Property Constraint Reasoning (ontology: Sciences/Biology)

The property 'has skeleton' applies to instances of 'organism subdivision', and 'body proper' is a subclass of 'organism subdivision'. Which class can appear as the value of 'has skeleton' for instances of 'body proper'?

A. stomochord
B. subdivision of skeleton
C. penile spine
D. posteromedial process

Answer: subdivision of skeleton