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: Pharmacology
Post dural (Spinal) puncture headache is due to : 
Select and explain. 
A. Seepage of CSF, B. Fine needle, C. Toxic effects of the drugs, D. Traumatic damage to nerve roots
A: Seepage of CSF
Answer: A: Seepage of CSF 
Explanation: None