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

The property 'vessel drains blood from' applies to instances of 'blood vessel', and 'endometrial blood vessel' is a subclass of 'blood vessel'. Which class can appear as the value of 'vessel drains blood from' for instances of 'endometrial blood vessel'?

A. anatomical structure
B. concentration of
C. apex of prostate
D. ganglion formation

Answer: anatomical structure