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
[{'content': 'A patient presents with acute renal failure and anuria. The USG is normal. Which of the following investigation will give best information regarding renal function – \nSelect and explain. \nA. Intravenous pyelogram, B. Retrograde pyelography, C. Antegrade pyelography, D. DTPA scan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Functional renal study is done by DTPA/MAG-3.', 'role': 'assistant'}]