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 two hours history of sudden onset of severe headache associated with nausea and vomiting. On clinical examination the patient had necks 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. Arteriovenous malformation haemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]