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
Longest acting among muscle relaxant is? 
Select and explain. 
A. Doxacurium, B. Rocuronium, C. Vecuronium, D. Atracurium
A: Doxacurium
Answer: A: Doxacurium 
Explanation: Ans. is 'a' i.e., Doxacurium Among the given options, only doxacurium is long acting. See explanation- 4 of session- 3.