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 is allergic to succinylcholine; the muscle relaxant of choice for this patient is? \nSelect and explain. \nA. Atracurium, B. Rocuronium, C. Doxacuronium, D. Pipecuronium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]