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: Pharmacology
[{'content': 'A patient with mitral stenosis had to undergo surgery. A pre-anaesthetic checkup revealed the increased liver enzymes. Which of the following inhalational agent should be preferred in this patient? \nSelect and explain. \nA. Xenon, B. Enflurane, C. Halothane, D. Sevoflurane', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Halothane is hepatotoxic and all fluorinated anesthetic agents can cause a dose-dependent decrease in arterial BP and de\xadpression of heart. Xenon has minimal effect on CVS function.', 'role': 'assistant'}]