This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
[{'content': 'Type of CT Scan used to characterise the chemical composition of kidney stones? \nSelect and explain. \nA. Spiral CT, B. Multidetector CT, C. Dual source CT, D. HRCT', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dual source CT uses two different x-ray sources with different Kvp and based on the interaction with different elements can characterize the type of kidney stones. Clinical dual-energy applications include: Characterization of abdominal masses, Chemical composition of renal calculi, Myocardial and pulmonary perfusion imaging.', 'role': 'assistant'}]