This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'REPEAT QUESTION. Renal Calculi associated with proteus infection \nSelect and explain. \nA. Triple phosphate, B. Uric Acid, C. Calcium Oxalate, D. Cysteine Stones.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Triple phosphate or struvite ( Calcium phosphate with ammonium magnesium phosphate ) is smooth and diy white. It grows in alkaline urine. Proteus being urea splitting organism splits urea to give ammonia and co2 whixh makes urine alkaline and promotes stag horn calculus ref : - Bailey and Love 27th edition ,chapter 76 , pg no 1406', 'role': 'assistant'}]