This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Post spinal headache can be prevented by 
Select and explain. 
A. Use of thinner needle, B. NSAIDs, C. Preanesthetic medication, D. Plenty of oral fluids
A: Use of thinner needle
Answer: A: Use of thinner needle 
Explanation: The most impoant causative factor for spinal headache is needle size, so use of small gauge needle is the best method to prevent post spinal headache. There is no evidence that any duration of bed rest after lumbar puncture has a role in preventing headache. Improving hydration by increased fluids (either oral or intravenous) has not been shown to prevent headache after lumbar puncture Ref Robbins 9/e pg 234