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
[{'content': 'Which of the following is the shoest acting non-depolarizing muscle relaxant (NDMR) and causes bronchospasm? \nSelect and explain. \nA. Succinyl choline, B. Rapacuronium, C. Atracurium, D. Pancuronium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rapacuronium has a rapid onset of action, minimal cardiovascular side effects, and a sho duration of action. It was withdrawn by the manufacturer following several repos of serious bronchospasm, including a few unexplained fatalities. Histamine release may have been a factor. Ref: Morgan, Jr. G.E., Mikhail M.S., Murray M.J. (2006). Chapter 9. Neuromuscular Blocking Agents. In G.E. Morgan, Jr., M.S. Mikhail, M.J. Murray (Eds), Clinical Anesthesiology, 4e.', 'role': 'assistant'}]