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: Surgery
Most common cause of sub-dural haematoma - 
Select and explain. 
A. Middle meningeal artery tear, B. Rupture of superior cerebral vein, C. Internal carotid artery tear, D. None of the above
B: Rupture of superior cerebral vein
Answer: B: Rupture of superior cerebral vein 
Explanation: It is due to rupture of bridging veins.