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 of the following has minimum MAC? \nSelect and explain. \nA. Methoxyflurane, B. N2O, C. Halothane, D. Desflurane', 'role': 'user'}, {'content': "Answer: A \nExplanation: Minimum alveolar concentration is defined as the alveolar concentration of an inhaled anesthetic agent that prevents movement in 50% of patients in response to a standardized surgical stimulus. Low MAC - High potency MAC values of adult Methoxyflurane: 0.16 Halothane: 0.75 Sevoflurane: 2.0 Isoflurane: 1.2 Desflurane: 6.0 Enflurane: 1.7 Xenon: 70 N2O: 104 Ref: Miller's anesthesia 8th edition Ref: Morgan & Mikhail's clinical anesthesiology 6e", 'role': 'assistant'}]