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
GFR is measured with which of the following? 
Select and explain. 
A. Iodohippurate, B. Tc 99m – DTPA, C. Tc 99m – MAG3, D. Tc 99m – DMSA
B: Tc 99m – DTPA
Answer: B: Tc 99m – DTPA 
Explanation: None