This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anaesthesia, Subject name: Anaesthesia
[{'content': 'Which anesthetic has a maximum MAC? \nSelect and explain. \nA. Nitrous oxide, B. Halothane, C. Desflurane, D. Isoflurane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MAC (age 30-55 years) % of 1 atmosphere Halothane 0.76 Isoflurane 1.15 Enflurane 1.63 Sevoflurane 1.85 Desflurane 6.0 Nitrous oxide 104 Basics of Anaesthesia 7e pg: 94', 'role': 'assistant'}]