This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
[{'content': 'All are predisposing causes of cerebral venous thrombosis except: \nSelect and explain. \nA. Hypotension, B. Oral contraceptives, C. Pregnancy, D. Aplastic anemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Aplastic anemia* Hypercoagulable states are associated with Cerebral vein thrombosis* Aplastic anemia is not associated with hypercoagulability', 'role': 'assistant'}]