This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
[{'content': 'Muscle relaxant used in renal failure - \nSelect and explain. \nA. Ketamine, B. Atracurium, C. Pancuronium, D. Fentanyl', 'role': 'user'}, {'content': "Answer: B \nExplanation: As Atracurium and Cis-atracurium are inactivated by Hoffman's elimination, they are the muscle relaxants of choice for both liver and renal failure.", 'role': 'assistant'}]