This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Most common cause of nephrolithiasis is? \nSelect and explain. \nA. Hypocitraturia, B. Hyperoxaluria, C. Hyperuricosuria, D. Idiopathic hypercalciuria', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hypercalciuria is the most common abnormality identified in calcium stone formers . The most common component of urinary calculi is calcium, which is a major constituent of nearly 80% of stones. Calcium oxalate comprises about 60% of all stones; mixed calcium oxalate and hydroxyapatite make up 20% ref : Campbell and Walsh Urology 11th edition , chapter 51 , pg no :- 1182', 'role': 'assistant'}]