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: Surgery
[{'content': 'Posterior communicating aery arises from \nSelect and explain. \nA. Internal carotid, B. Middle cerebral, C. Basilar, D. Posterior cerebral', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Internal carotid Internal carotid aery has five main branches to the brain: anterior cerebral, middle cerebral, ophthalmic, anterior choroidal and posterior communicating aery.', 'role': 'assistant'}]