<prompt> Renal calculi associated with proteus infectionUric acidTriple phosphateCalcium oxalateXanthine  <response>: Triple phosphate or struvite Calcium phosphate with ammonium magnesium phosphate is smooth and diy white, grows in alkaline medium. Proteus being urea splitting organism splits urea to give ammonium which provides the required alkaline medium. Reference : page 1292 Bailey and Loves sho practice of surgery 26th edition 