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': 'Vesicoureteric reflux is demonstrated by using \nSelect and explain. \nA. DMSA, B. DTPA, C. MAG3 - Tc 99, D. I123 iodocholesterol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. MAG3 - Tc99', 'role': 'assistant'}]