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 drug potentiates neuromuscular blockade \nSelect and explain. \nA. Propranolol, B. Amlodipine, C. Metformin, D. Penicillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Calcium channel blocker potentiates neuromuscular blockade.', 'role': 'assistant'}]