This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Shortest acting muscle relaxant: \nSelect and explain. \nA. Tubocurarine, B. Succinylcholine, C. Pancuronium, D. Atracurium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. SuccinylcholineThere are two types of muscle relaxant - depolarizing and non-depolarizing, succinylcholine is the shortest acting depolarizing MR and mivacurium is longest acting non-depolarizing MR.', 'role': 'assistant'}]