<prompt> Renal Calculi associated with Proteus infection isUric AcidTriple PhosphateCalcium oxalateXanthine  <response>: Phosphate calculus Phosphate calculus is smooth and diy whiteIt tends to grow in alkaline urine, especially when urea-splitting Proteus organisms are present; As a result, the calculus may enlarge to fill most of the collecting system, forming a staghorn calculusStaghorn calculus may be clinically silent for years and may present with haematuria, urinary infection or renal failureRef: Harrisons 18e p2387; Bailey 26e p1293 