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: Anaesthesia
A 20 year old man complain of headache after spinal anaesthesia. Which of the following is the likely cause? 
Select and explain. 
A. Raised ICT, B. Meningitis, C. CSF leak, D. Encephalitis
C: CSF leak
Answer: C: CSF leak 
Explanation: Here the headache is believed to be due to loss of CSF. It can be minimised by using a smaller bone needle.