This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urogenital System, 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: Ans. is \'a\' i.e., Intravenous Urography Intravenous urography or pyelography (I VU or I VP) is the most sensitive modality to detect early renal tuberculosis. In the early stages it shows irregularity or destruction of one or more renal papillae.For ultrasound, Campbell writes- "Ultrasonography is of limited value in the initial investigation of the genitourinary TB."For CT, Campbell writes - "CT is of limited value in the early investigation of genitourinary TB because intravenous urography gives such accurate pictures".For MRI, Campbell writes - "MRI has very little application in the management of genitourinary TB"', 'role': 'assistant'}]