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
[{'content': 'The drug that produces neuromuscular blockade by persistent depolarization is: \nSelect and explain. \nA. D-tubocurarine., B. Gallamine., C. Pancuronium., D. Decamethonium.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Decamethonium is a peripherally acting skeletal muscle relaxant. It produces an immediate and rapid depolarization of the motor end plate. D-tubocurarine, pancuronium and gallamine are competitive antagonists of acetylcholine at the motor end plate and produce skeletal muscle relaxation.', 'role': 'assistant'}]