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 investigation of choice for Renal Scarring defect in Kidney is – \nSelect and explain. \nA. DMSA scan, B. DTPA scan, C. DEXA scan, D. MCU', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Renal scarring (e.g. in reflex nephropathy) is best assessed by Tc-99-D11ISA scintigraphy which is static renal\xa0scintigraphy for assessment of structure of kidney.', 'role': 'assistant'}]