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
Fastest acting agent – 
Select and explain. 
A. Sevoflurane, B. Desflurane, C. Isoflurane, D. None
B: Desflurane
Answer: B: Desflurane 
Explanation: Desflurane has least B : G partition coefficient → fastest induction.