<prompt> Most common cause of nephrolithiasis is?HypocitraturiaHyperoxaluriaHyperuricosuriaIdiopathic hypercalciuria  <response>: 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 