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
In a child, non-functioning kidney is best diagnosed by 
Select and explain. 
A. Ultrasonography, B. IVU, C. DTPA renogram, D. Creatinine clearance
C: DTPA renogram
Answer: C: DTPA renogram 
Explanation: None