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': 'Most common cause of cerebrovascular accident is: \nSelect and explain. \nA. Embolism, B. Arterial thrombosis, C. Venous thrombosis, D. Hemorrhage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Embolism* MC cause of cause of CVA- Ischemia (85% cases) due Embolism (75%) > Thrombosis (25%)* CVA may also be due to hemorrhage (<15%) - Parenchymal, Subarachnoid, Epidural or Subdural hemorrhage* Stroke in young women in India are predisposed by Cortical venous thrombosis due to OCP consumption.', 'role': 'assistant'}]