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
Least diffusion coefficient is for : 
Select and explain. 
A. Isoflurane, B. Enflurane, C. Halothane, D. N20
D: N20
Answer: D: N20 
Explanation: D i.e N20