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
Which of the following agents is used to measure glomerular filtration rate (GFR) – 
Select and explain. 
A. Iodohippurate, B. Tc99m – DTPA, C. Tc99m – MAG3, D. Tc99m – DMSA
B: Tc99m – DTPA
Answer: B: Tc99m – DTPA 
Explanation: In dynamic renal scintigraphy :-


GFR  → Tc - 99m - DTPA
Effective renal plasma flow → Tc-99m - MAG3, I - 123 - OIH.