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': 'Renal stone which is formed due to proteus infection is? \nSelect and explain. \nA. Calcium oxalate, B. Uric acid, C. Cystine, D. Struvite', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) StruviteRef::Robbiris 8thed Table 20-12, Sabiston Textbook of Surgery, 18thed chapter 77,', 'role': 'assistant'}]