This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'An adult hypeensive male presented with sudden onset severe headache and vomiting. On examination, there is marked neck rigidity and no focal neurological deficit was found. The symptoms are most likely d/t \nSelect and explain. \nA. Intracerebral parenchymal hemorrhage, B. Ischemic stroke, C. Meningitis, D. Subarachnoid hemorrhage', 'role': 'user'}, {'content': "Answer: D \nExplanation: Harrison's principles of internal medicine 17 th edition. *SAH characterised by headache ,which is generalised and sudden onset ,neckstiffness,vomiting is common *Althoughsudden headache without focal neurological deficit may occur as hallmark feature of aneurysmal rupure ,but focal neurological deficit may occur .", 'role': 'assistant'}]