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': 'Muscle relaxant used in renal failure : \nSelect and explain. \nA. Ketamine, B. Atracurium, C. Pancuronium, D. Fentanyl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Atracurium', 'role': 'assistant'}]