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': 'A seventy year old patient is posted for a surgery which is likely to last 4–6 hours. The best inhalational agent of choice for maintenance of anaesthesia in such a case is – \nSelect and explain. \nA. Methoxyflurane, B. Ether, C. Trichlorethylene, D. Desflurane', 'role': 'user'}, {'content': 'Answer: D \nExplanation: "The rapid elimination of desflurane make it the inhalational anaesthetic of choice for elderly patients". — Morgan', 'role': 'assistant'}]