This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
[{'content': 'Anesthetic drug which has highest minimum alveolar concentration is \nSelect and explain. \nA. Nitrous oxide, B. Isoflurane, C. Desflurane, D. Xenon', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MAC is measure of potency of inhalational anesthetic drug which is minimum concentration required to produce immobility in 50% individuals Nitrous oxide has lowest potency with highest MAC value', 'role': 'assistant'}]