This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
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 due to: 
Select and explain. 
A. Intracerebral parenchymal hemorrhage, B. Ischemic stroke, C. Meningitis, D. Subarachnoid hemorrhage
D: Subarachnoid hemorrhage
Answer: D: Subarachnoid hemorrhage 
Explanation: Ans. d. Subarachnoid hemorrhage Most likely diagnosis in an adult hypeensive male with sudden onset severe headache, vomiting with marked neck rigidity without focal neurological deficit would be subarachnoid hemorrhage.