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': 'Fastest acting agent – \nSelect and explain. \nA. Sevoflurane, B. Desflurane, C. Isoflurane, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Desflurane has least B : G partition coefficient → fastest induction.', 'role': 'assistant'}]