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': 'Least cardiotoxic agent – \nSelect and explain. \nA. Isoflurane, B. Enflurane, C. Sevoflurane, D. Halothane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cardiac output is best maintained by Isoflurane by reflex tachycardia as it does not depress baroreceptor reflex → Most cardiovascular stable inhalational agent → Inhalational agent of choice for cardiac surgery.', 'role': 'assistant'}]