This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear medicine, Subject name: Radiology
Radio isotope Preferred for measuring GFR: 
Select and explain. 
A. OIH, B. DMSA, C. DTPA, D. MAG 3
C: DTPA
Answer: C: DTPA 
Explanation: Functional / Dynamic Renography * Done with Tc99m DTPA / Tc99m - MAG3 * Tc99m DTPA -evaluate G.F.R * Tc99m MAG3 - evaluate Renal function Renal perfusion Renal plasma flow