This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
45yr old female with sudden onset headache and neck rigidity There is no history of trauma .. 
Select and explain. 
A. SAH, B. Meningitis, C. SDH, D. Hemorrhagic stroke
A: SAH
Answer: A: SAH 
Explanation: ref : david sutton 9th ed