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
Hyperkalemia without ECG changes may be treated with all except : 
Select and explain. 
A. Calcium gluconate, B. Salbutamol, C. Na bicarbonate, D. Insulin with dextrose
A: Calcium gluconate
Answer: A: Calcium gluconate 
Explanation: Calcium antagonizes the cardiac conduction abnormalities induced by potassium. In the given question, the patient has no ECG changes; therefore calcium gluconate will not be useful. Use of calcium gluconate should be restricted to life-threatening hyperkalemia.