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: A i.e. Radionuclide scanning', 'role': 'assistant'}]