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
Functional analysis of kidney is best done by 
Select and explain. 
A. Radionuclide scanning, B. IVP, C. Ultrasound, D. MRI
A: Radionuclide scanning
Answer: A: Radionuclide scanning 
Explanation: A i.e. Radionuclide scanning