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': 'Distal renal tubular acidosis is associated with \nSelect and explain. \nA. Oxalate stones, B. Citrate, C. Calcium stones, D. Uric acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]