This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Proteus infection is associated with the development of which type of renal calculi? \nSelect and explain. \nA. Uric Acid, B. Triple Phosphate, C. Calcium Oxalate, D. Xanthine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Struvite stones are produced by urease producing bacteria such as proteus, which alkalanize the urine and produce ammonium. Phosphate combines with magnesium, calcium and ammonium to produce struvite. These can form large staghorn calculi. Ref: The Little Black Book of Nephrology and Hypeension By Charles N. Jacobs, Pages 175-83; Medical Therapy in Urology By Iqbal S. Shergill, Page 159', 'role': 'assistant'}]