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
Which of the following imaging modality is most sensitive to detect early renal tuberculosis – 
Select and explain. 
A. Intravenous urography, B. Ultrasound, C. Computed tomography, D. Magnetic resonance imaging
A: Intravenous urography
Answer: A: Intravenous urography 
Explanation: Essentially, early findings are best detected on IVP while USG and CT are useful for late or chronic changes.