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': 'Which of the following muscle relaxant has the maximum duration of action – \nSelect and explain. \nA. Atracurium, B. Vecuronium, C. Rocuronium, D. Doxacurium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: On this, there is controversy in different books :-\n\n\nAccording to Goodman & Gilman, Pancuronium is the longest acting.\nAccording to Lee Pipecuronium is the longest acting.\nSome books have given Doxacurium as longest acting (KDT, Ajay Yadav)\n\n\nYou are lucky as you have got only one amongst these three. For this question doxacurium is the answer for sure.', 'role': 'assistant'}]