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': 'In chronic renal failure which one is contraindicated? \nSelect and explain. \nA. Furosenmide, B. Ethacrynic acid, C. Triamterenc, D. Bumetanide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' Triamterene o K+ spring diuretics can cause serious hyperkalemia when renal function is inadequate.", 'role': 'assistant'}]