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': 'Functional analysis of kidney is best done by – \nSelect and explain. \nA. Radionuclide scanning, B. IVP, C. Ultrasound, D. MRI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Functional imaging or dynamic renal scintigraphy is done by Tc - 99m - DTPA or Tc - 99m - MAG3', 'role': 'assistant'}]