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 evaluating a renal mass is ? \nSelect and explain. \nA. Plain X-ray, B. CT scan, C. IVP, D. Renal scintigraphy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is\'b\'i.e., CT scan (Ref: Grainger &/e p.881) "Computed Tomography is still the investigation of for evaluating and characterizing solid renal masse', 'role': 'assistant'}]