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: Medicine
Most common cause of subarachnoid hemorrhage is - 
Select and explain. 
A. Hypertension, B. Berry aneurysm, C. Intracranial tumors, D. Arterio-venous malformations (AVM)
B: Berry aneurysm
Answer: B: Berry aneurysm 
Explanation: None