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
[{'content': 'The most useful diuretic agent in the treatment of recurrent calcium stones is \nSelect and explain. \nA. Mannitol, B. Furosemide, C. Spironolactone, D. Hydrochlorothiazide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]