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: Medicine
[{'content': 'A 30-year-old man presents to the emergency with complaints of muscle weakness, nausea, vomiting and fatigue. ECG showed tall peaked T waves, prolonged PR interval, wide QRS and absent P wave. Which of the following drugs is not used in management? \nSelect and explain. \nA. Beta-blockers, B. Sodium bicarbonate, C. Calcium gluconate, D. Insulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Beta-blockers', 'role': 'assistant'}]