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: Surgery
[{'content': 'Isotope Renogram ? \nSelect and explain. \nA. Study of renin mechanism, B. Contrast study of kidneys, ureter and bladder, C. Utilised in mapping the anatomy of kidneys, D. Graphic representation of radioactivity of kidneys', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Graphic representation of radioactivity of kidneys", 'role': 'assistant'}]