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': 'All the following cause malignant hyperpyrexia except ? \nSelect and explain. \nA. N20, B. Halothane, C. Methoxyflurane, D. Isoflurane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. N20', 'role': 'assistant'}]