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
[{'content': 'Most common complication of spinal anesthesia is \nSelect and explain. \nA. Hypotension, B. Headache, C. Meningitis, D. Arrythmia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Hypotension', 'role': 'assistant'}]