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: Medicine
[{'content': 'Which of the following is an alkaline type of renal calculi? \nSelect and explain. \nA. Calcium stone, B. Uric acid stone, C. Cystine stone, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Alkaline\xa0-\u202fCalcium stone\nAcidic -\u202fUric acid and cystine stones', 'role': 'assistant'}]