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': 'Which of the following is contraindicated in CRF – \nSelect and explain. \nA. Halothane, B. Enflurane, C. Desflurane, D. Isoflurane', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Enflurane and sevoflurane are considered undesirable for patients with renal disease.', 'role': 'assistant'}]