This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
Shoest acting non depolarising muscle relaxant 
Select and explain. 
A. Succinylcholine, B. Rapacuronium, C. Atracurium, D. Pancuronium
B: Rapacuronium
Answer: B: Rapacuronium 
Explanation: Refer Miller's anesthesia 5/e p 892 Among the given options Rapacuronium IA the shoest acting drug Rapacuronium has been withdrawn from the market because it produces intense bronchospasm in a significant number of patients Mivacurium is shoest acting NDMR