This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, 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: (Seepage of CSF) (517 - Lee's 13th) (360-KDT 6th)* Post spinal headache is due to seepage of CSF: can be minimised by using smaller bore needle (KDT)* Typical location is bifrontal and / or occipital* It is more common in Young pregnant patients and with accidental dural puncture rate during epidural anaesthesia using Touhyneedle (60 - 80%) Reduced by introduction of size 25 G and 27 - G whitacre pencil point needles. Which replaced cutting needles* Paralysis of cranial nerve. All cranial nerves except 1st, 9, 10th can be involved after spinal Anaesthesia. Most commonly (90%) 6th nerve is involved (Because of the longest course of 6th nerve)", 'role': 'assistant'}]