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': 'Most common post-operative complication of spinal anaesthesia - \nSelect and explain. \nA. Post-spinal headache, B. Hypotension, C. Meningitis, D. Urinary retention', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Post-spinal headache Complications of spinal anaesthesiaIntraoperativePostoperativeo Hypotension (most common)o Bradycardiao Respiratory depressiono Cardiac arresto Hypothermia in elderlyo Haedache (post dural puncture headach) - most commono Cranial nerve palsies (any cranial nerve except the 1st, 9th & 10th most commonly 6th nerve is involved)o Cauda equina syndromeo Arachnoiditiso Meningitiso Urinary retentiono Neurological deficit, e.g. paraplegiao Muscle wasting", 'role': 'assistant'}]