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': 'Drug used for post-operative shivering ? \nSelect and explain. \nA. Atropine, B. Pethidine, C. Thiopenone, D. Suxamethonium', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pethidine Post-anaesthesia shivering (PAS) Post anaesthesia (post operative) shivering occurs in 40% of patients recovering from general anaesthesia. Some time it is preceded by central hypothermia and peripheral vasoconstriction, indicating that it is a thermoregulatory mechanism. Pethidine is most effective drug for treatment of PAS. Other drugs used are -clonidine, doxapram, ketanserin, alfentonil, butorphanol, chlorpromazine.", 'role': 'assistant'}]