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: Medicine
Renal Calculi associated with Proteus infection is 
Select and explain. 
A. Uric Acid, B. Triple Phosphate, C. Calcium oxalate, D. Xanthine
B: Triple Phosphate
Answer: B: Triple Phosphate 
Explanation: 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 failure(Ref: Harrison's 18/e p2387; Bailey 26/e p1293)