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': 'Which of the following imaging modality is most sensitive to detect early renal tuberculosis – \nSelect and explain. \nA. Intravenous urography, B. Ultrasound, C. Computed tomography, D. Magnetic resonance imaging', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Essentially, early findings are best detected on IVP while USG and CT are useful for late or chronic changes.', 'role': 'assistant'}]