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: Surgery
A patient with sudden headache, vomiting & unconsciousness, diagnosis is - 
Select and explain. 
A. Subarachnoid haemorrhage, B. Intracerebral haemorrhage, C. Subdural haemorrhage, D. Extradural haemorrhage
A: Subarachnoid haemorrhage
Answer: A: Subarachnoid haemorrhage 
Explanation: None