The most common cause of subarachnoid hemorrhage is:
Answer is C (Aneurysm): The most common cause of subarachnoid haemorrhage is rupture of a saccular aneurysm (Saccular aneurysms are synonymous with Berry Aneurysms or 'Circle of Willi's aneurysms' and most commonly occur in the anterior circulation on the Circle of Willis).
Aeriovenous malformation
Cavernous angioma
Aneurysm
Aneurysm