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': 'Following are the features of persistent post operative pain except? \nSelect and explain. \nA. Pain that develops after surgical procedure, B. Pain present for atleast 3 months, C. Pain where other causes are excluded, D. Pain from pre surgical problem is excluded', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pain present for atleast 3 months Precision does not currently exist in defining persistent post operative pain, however following features are taken into consideration :- Pain that develops after surgical procedure Pain present for atleast 2 months Pain where other causes are excluded Pain from pre surgical problem is exclu", 'role': 'assistant'}]