This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'Patient with right lumbar region pain. Most likely diagnosis is: \nSelect and explain. \nA. Acute cholecystitis, B. Acute pyelonephritis, C. Right renal calculus, D. Left renal calculus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C Right renal calculusCoronal reconstructed CT KUB image shows a calcific density (hyperdense) in lower pole of right kidney. Nearly all renal calculi (even those radiolucent on radiograph) are seen onCT KUB except indinavir associated calculi. NC-CT is IOC for urolithiasisQ.', 'role': 'assistant'}]