This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: Medicine
A patient comes to ER with headache describing it as worst headache in his life. What is the next step? 
Select and explain. 
A. CT brain, B. Lumbar puncture, C. MRI brain, D. Observation and analgesics
A: CT brain
Answer: A: CT brain 
Explanation: Worst headache of my life s/o SAH Any intracranial bleeding, we need to do NCCT Shows blood in syln fissure from MCA (Middle cerebral aery) Lumbar puncture- C/I as patient may be having | ICT