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': 'Maximum emesis causing anaesthetic – \nSelect and explain. \nA. N2O, B. Diethyl ether, C. Chloroform, D. Thiopental', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ether is one of the most emetogenic of all the inhalational agents → High incidence of post-operative nausea &\xa0vomiting.', 'role': 'assistant'}]