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
[{'content': 'Post dural (Spinal) puncture headache is due to : \nSelect and explain. \nA. Seepage of CSF, B. Fine needle, C. Toxic effects of the drugs, D. Traumatic damage to nerve roots', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]