This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
The most useful diuretic agent in the treatment of recurrent calcium stones is 
Select and explain. 
A. Mannitol, B. Furosemide, C. Spironolactone, D. Hydrochlorothiazide
D: Hydrochlorothiazide
Answer: D: Hydrochlorothiazide 
Explanation: The thiazides are useful in the prevention of calcium stones because these drugs inhibit the renal excretion of calcium. In contrast, the loop agents facilitate calcium excretion.