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
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? 
Select and explain. 
A. Beta-blockers, B. Sodium bicarbonate, C. Calcium gluconate, D. Insulin
A: Beta-blockers
Answer: A: Beta-blockers 
Explanation: Ans. a. Beta-blockers