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 (investigation of choice) 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: A i.e. Intravenous urography', 'role': 'assistant'}]