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
True about N2O – 
Select and explain. 
A. Good muscle relaxant, B. Low potency and good analgesia, C. High potency and poor analgesia, D. None
B: Low potency and good analgesia
Answer: B: Low potency and good analgesia 
Explanation: N2O is least potent (MAC = 105%).
It has a good analgesic but poor muscle relaxant activity.