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': 'True about N2O – \nSelect and explain. \nA. Good muscle relaxant, B. Low potency and good analgesia, C. High potency and poor analgesia, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: N2O is least potent (MAC = 105%).\nIt has a good analgesic but poor muscle relaxant activity.', 'role': 'assistant'}]