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

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

A. buccal vestibule
B. preoccipital notch
C. anatomical structure
D. anatomical border

Answer: anatomical structure