This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urolithiasis, Subject name: Surgery
[{'content': 'Stag horn calculi associated with Proteus infection are: \nSelect and explain. \nA. Uric acid stones, B. Triple phosphate stones, C. Calcium oxalate stones, D. Cystine stones', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Triple phosphate stonesRef : Bailey & Love 26th ed. Ch 75/1292', 'role': 'assistant'}]