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
[{'content': 'A 45-year-old hypertensive male patient presented in the casualty with 2-hour history of sudden onset of a severe headache associated with nausea and vomiting. On clinical examination, the patient had neck stiffness and right-sided ptosis. Rest of the neurological examination was normal. What is the clinical diagnosis? - \nSelect and explain. \nA. Hypertensive brain haemorrhage, B. Migraine, C. Aneurysmal subarachnoid haemorrhage, D. Arterio venous malformation haemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]