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
Most common cause of subarachnoid hemorrhage IS 
Select and explain. 
A. AV malformation, B. Cavernous angioma, C. Aneurysm, D. Hypeension
C: Aneurysm
Answer: C: Aneurysm 
Explanation: *Commonly result from rupture of congenital berry aneurysms in the interpeduncular cistern Ref Harrison20th edition pg 2344