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': 'Which of the following inhalation anaesthetics should be avoided in middle ear surgery \nSelect and explain. \nA. Halothane, B. Nitrous oxide, C. Ether, D. Isoflurane', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nitrous oxide', 'role': 'assistant'}]