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
[{'content': '45yr old female with sudden onset headache and neck rigidity There is no history of trauma .. \nSelect and explain. \nA. SAH, B. Meningitis, C. SDH, D. Hemorrhagic stroke', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : david sutton 9th ed', 'role': 'assistant'}]