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. Sefoflurane, B. Sefoflurane, C. Isoflurane, D. None
B: Sefoflurane
Answer: B: Sefoflurane 
Explanation: B i.e. Desflurane