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: Radiology
Vesicouretric reflux is demonstrated by 
Select and explain. 
A. Tc-99 - DTPA, B. Tc-99 - DMSA, C. Tc-99 - MAG-3, D. I - 123 - OIH
B: Tc-99 - DMSA
Answer: B: Tc-99 - DMSA 
Explanation: VUR - Tc 99 - DMSA
GFR estimation Tc 99 - DTPA