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
All of the following statements about amiloride are true EXCEPT : 
Select and explain. 
A. It antagonises the action of aldosterone, B. It is the drug of choice for the treatment of lithium induced diabetes insipidus, C. It decreases calcium loss in the urine, D. It is more potent than triamterene
A: It antagonises the action of aldosterone
Answer: A: It antagonises the action of aldosterone 
Explanation: Amiloride acts by blocking epithelial Na+ channels. It has no effect on aldosterone receptors.
It is more potent than triamterene.
It decreases Ca2+ loss in the urine
It is the drug of choice for lithium-induced DI.