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
Thunderclap headache is a feature of 
Select and explain. 
A. TIA, B. Completed stroke, C. ICH, D. SAH
D: SAH
Answer: D: SAH 
Explanation: 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.