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': 'Which of the following muscle relaxant has the maximum duration of action \nSelect and explain. \nA. Atracurium, B. Vecuronium, C. Rocuronimum, D. Doxacurium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Non-depolarising blockers : long acting (>50min): d-tubocurare , pancuronium, doxacurium, pipecuronium Intermediate acting(20-50mins) : Vecuronium, Atracurium, cisatracurium, rocuronium. Sho acting(<20mins) : Mivacurium, Rapacuronium.', 'role': 'assistant'}]