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
Post dural puncture headache, true about ? 
Select and explain. 
A. Common in elderly, B. Small bore needle prevents it, C. Early ambulation increases incidence, D. All
B: Small bore needle prevents it
Answer: B: Small bore needle prevents it 
Explanation: B i.e. (Small bore needle prevents it)