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': 'Investigation of choice for advanced renal tuberculosis is? \nSelect and explain. \nA. CT, B. IVP, C. USG, D. MRI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CT REF: Grainger 4th edition p. 1547/1490 See APPENDIX-63 for list of "Investigations of choice" Early renal TB-IVP is most sensitive imaging modality Advanced renal TB - CT > IVP > USG ( order of sensitivity)', 'role': 'assistant'}]