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: Surgery
[{'content': 'Earliest and often the only presentation of TB kidney is - \nSelect and explain. \nA. Increased frequency, B. Pain, C. Hematuria, D. Renal calculi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]