This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
[{'content': 'The investigation of choice for renal scarring defect in kidney: \nSelect and explain. \nA. DMSA scan, B. DTPA scan., C. Dexa scan, D. MCU', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) DMSA scanRef: Bailey 26th Edition, Pages 1276-1277* IOC for Renal Structure scarring - DMSA* IOC for Congenital PUJ obstruction - DTPA', 'role': 'assistant'}]