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
Which of the following muscle relaxant has the maximum duration of action - 
Select and explain. 
A. Atracurium, B. Vecuronium, C. Rocuronium, D. Doxacurium
D: Doxacurium
Answer: D: Doxacurium 
Explanation: Ans. is 'd' i.e., Doxacurium o 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.