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': 'Longest acting muscle relaxant is? \nSelect and explain. \nA. Atracurium, B. Vecuronium, C. Doxacurium, D. Rocuronium', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Doxacurium Amongst the given options doxacurium is longest acting (Duration of action 90-120 minutes). Rocuronium (duration of action 30-60 minutes), Atracurium (duration of action 30-60 minutes) and vecuronium (duration of action 60-90 minutes) have shoer duration of action than doxacurium.", 'role': 'assistant'}]