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': 'Cause of post operative hypeension \nSelect and explain. \nA. Pre-operative hypeension, B. Inadequate analgesia, C. Phaeochromocytoma, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All i.e. A, B, C', 'role': 'assistant'}]