This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 1, Subject name: Radiology
[{'content': 'Gamma Rays Are used in which Diagnostic Modality ? \nSelect and explain. \nA. Fluoroscopy, B. CT Scan, C. MRI, D. Bone scan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gamma Rays are used in Radioisotope studies/scintigraphy studies Bone scan is a radioisotope study done using Tc99m -MDP to detect skeletal metastasis Fluoroscopy and CT scan uses Xrays Radiowaves are used in MRI', 'role': 'assistant'}]