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': 'Thunderclap headache is a feature of \nSelect and explain. \nA. TIA, B. Completed stroke, C. ICH, D. SAH', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) SAHRef: Sabiston 20th Page 1904* Subarachnoid hemorrhage usually results in a sudden severe thunderclap headache. A patients describes the worst headache of my life.', 'role': 'assistant'}]