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 cardiotoxic agent – 
Select and explain. 
A. Isoflurane, B. Enflurane, C. Sevoflurane, D. Halothane
A: Isoflurane
Answer: A: Isoflurane 
Explanation: 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.