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
Following are the features of persistent post operative pain except? 
Select and explain. 
A. 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
B: Pain present for atleast 3 months
Answer: B: Pain present for atleast 3 months 
Explanation: 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