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
Impared Renal Function is assessed by 
Select and explain. 
A. MAG3, B. IodoHippurate, C. DMSA Scan, D. DTPA
A: MAG3
Answer: A: MAG3 
Explanation: A i.e. MAG3