This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pharmacology
[{'content': 'In chronic renal failure, which of the following diuretics is contraindicated? \nSelect and explain. \nA. Ethacrynic acid, B. Furosemide, C. Triamterene, D. Bumetanide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Potassium sparing diuretics like Amiloride and Triamterene etc are avoided in patients with renal failure due to risk of development of severe hyperkalemia. Loop diuretics are safe in renal failure. Ethacrynic acid, furosemide and bumetanide are examples of loop diuretics. Ethacrynic acid is associated with deafness', 'role': 'assistant'}]