This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Subdural Hematoma (SDH) is caused by \nSelect and explain. \nA. Bridging veins, B. Caroticocavemous fistula rupture, C. Middle meningeal artery, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Bridging veins # SUBDURAL BLEEDING arises from rupture of cortical vessels/bridging veins.> Relatively severe trauma> No lucid interval> Diffuse concave lesion on computed tomography> Require immediate transfer to a neurosurgical unit for decision on evacuation 50 per cent mortality.', 'role': 'assistant'}]