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': '"Shivering" is observed in the early part of the postoperative period due to: \nSelect and explain. \nA. Chloroform, B. Halothane, C. Trichloroethylene, D. Ether', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Post-operative shivering (halothane shakes) and hypothermia are maximum with halothane. Pethidine is used for the treatment of this condition.', 'role': 'assistant'}]