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
[{'content': 'Posterior communicating aery is 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 the cerebral pa of the internal carotid aery. The cerebral pa lies at the base of the brain.Ref: Human Anatomy, B D Chaurasia, 4th Edition, Volume 3, Chapter 6, Page 103.', 'role': 'assistant'}]