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
[{'content': 'All of the following statements about amiloride are true EXCEPT : \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Amiloride acts by blocking epithelial Na+ channels. It has no effect on aldosterone receptors.\nIt is more potent than triamterene.\nIt decreases Ca2+ loss in the urine\nIt is the drug of choice for lithium-induced DI.', 'role': 'assistant'}]