This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
True about posterior communicating aery is: 
Select and explain. 
A. A branch of posterior cerebral aery, B. A branch of superior cerebral aery, C. A branch of internal carotid aery, D. A branch of external carotid aery
C: A branch of internal carotid aery
Answer: C: A branch of internal carotid aery 
Explanation: A branch of internal carotid aery