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': 'Calcification is best detected by \nSelect and explain. \nA. X-ray, B. USG, C. CT Scen, D. MRI', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. CT Scan', 'role': 'assistant'}]