This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
Renal coical imaging is done by 
Select and explain. 
A. DTPA, B. DMSA, C. MAG3, D. UIH
B: DMSA
Answer: B: DMSA 
Explanation: (Ref: Grainger&;s diagnostic radiology, 6th ed; page 133)