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': 'Maximum duration of action is seen with \nSelect and explain. \nA. Atracurium, B. Rocurium, C. Pancuronium, D. Rapacurium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Non-depolarising blockers : Long acting (>50mins) : d-Tubocurare, Pancuronium, Doxacurium, Pipecuronium. Intermediate acting (20-50mins) : Vecuronium, Atracurium ,Cisatracurium, Rocuronium . Sho acting (<20mins) : Mivacurium,Rapacuronium.', 'role': 'assistant'}]