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': 'Which of the following potassium sparing diuretics cause renal stones? \nSelect and explain. \nA. Spironolactone, B. Eplerenone, C. Triamterene, D. Amiloride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Triamterene is only slightly soluble and may precipitate in the urine, causing kidney stones. Ref: Katzung, 11th edition, Chapter 15.', 'role': 'assistant'}]