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': 'In a child, non-functioning kidney is best diagnosed by \nSelect and explain. \nA. Ultrasonography, B. IVU, C. DTPA renogram, D. Creatinine clearance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]