This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inhalational Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'Which of the following anaesthetic agent has highest MAC (Minimum Alveolar Concentration) \nSelect and explain. \nA. Nitrous oxide, B. Xenon, C. Desfluane, D. Ether', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MAC is the minimum alveolar concentration of on inhaled anesthetic required to prevent movements in 50% of patients in response to a standardized stimulus. N2O has highest MAC 104 Methoxyflurane has lowest MAC Comparing MAC of different agents we can get an idea of there potency. High MAC low potency Low MAC high potency', 'role': 'assistant'}]