This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Posterior communicating aery a branch of \nSelect and explain. \nA. Internal carotid, B. External carotid, C. Middle cerebral, D. Posterior superior cerebellar', 'role': 'user'}, {'content': "Answer: A \nExplanation: Posterior communicating aery is a branch of internal carotid which connects posterior cerebral aery Ref: Gray's 40e/p-250-251", 'role': 'assistant'}]