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 radionuclide is best suited for measurement of GFR? 
Select and explain. 
A. DTPA, B. DMSA, C. Ohoiodohippurate, D. EDTA
A: DTPA
Answer: A: DTPA 
Explanation: Ans. DTPA