This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, 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: Post-anaesthesia shivering (PAS)Post anaesthesia (postoperative) shivering occurs in 40% of patients recovering from general anaesthesiaSometimes it is preceded by central hypothermia and peripheral vasoconstriction, indicating that it is a thermoregulatory mechanismPethidine is most effective drug for treatment of PASOther drugs used are-clonidine, doxapram, ketanserin, alfentanil, butorphanol, chlorpromazine.(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no. 1264,1265)", 'role': 'assistant'}]