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: Pharmacology
[{'content': 'Which of the following drugs are belived to be effective in the treatment of post-operative shivering! \nSelect and explain. \nA. Ondansetron, B. Diclofenac, C. Pethidine, D. Paracetamol', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Pethidine o Pethidine is most effective drug for treatment of PAS (Post-anaesthesia shivering). o Other drugs used are --clonidine, doxapram, ketanserin, alfentonil, butorphanol, chlorpromazine.", 'role': 'assistant'}]