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

The property 'skeleton of' applies to instances of 'anatomical structure', and 'pulmonary neuroendocrine body' is a subclass of 'anatomical structure'. Which class can appear as the value of 'skeleton of' for instances of 'pulmonary neuroendocrine body'?

A. antacid
B. anatomical structure
C. metal cation
D. neural tube lumen

Answer: anatomical structure