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': 'In increased ICT, agent used for anesthesia \nSelect and explain. \nA. N20, B. Trilene, C. Ether, D. Isoflurane', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Isoflurane', 'role': 'assistant'}]