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
Which of the following potassium sparing diuretics cause renal stones? 
Select and explain. 
A. Spironolactone, B. Eplerenone, C. Triamterene, D. Amiloride
C: Triamterene
Answer: C: Triamterene 
Explanation: Triamterene is only slightly soluble and may precipitate in the urine, causing kidney stones. Ref: Katzung, 11th edition, Chapter 15.