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': 'The gold standard method for detection of renal scarring in patient with recurrent urinary tract infection is: \nSelect and explain. \nA. 99 Tc- DMSA scan, B. 99 Tc-DTPA scan, C. 99Tc-MIBG Scan, D. 99Tc-MDP scan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. 99 Tc- DMSA scan', 'role': 'assistant'}]