This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Most common cause of subarachnoid hemorrhage IS \nSelect and explain. \nA. AV malformation, B. Cavernous angioma, C. Aneurysm, D. Hypeension', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *Commonly result from rupture of congenital berry aneurysms in the interpeduncular cistern Ref Harrison20th edition pg 2344', 'role': 'assistant'}]