A 40 year old female presents with a history of sudden onset of headache and nausea which passed off with rest and analgesics.Later she developed blurring of vision for a few days. On the day of admission she had developed third nerve palsy with neck rigidity. The temperature was 100°F.The most likely diagnosis is -: (A) Acute attack of migraine, (B) Viral encephalitis, (C) Sub-arachnoid haemorrhage, (D) Severe hypertension
Answer is C. None