This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': 'Which bone scan is done to detect metastasis of bone is \nSelect and explain. \nA. Tc 99 diphosphonate, B. Th201, C. Tc 99 DMSA, D. Tc 99 sulphur colloid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bone scan is performed with technetium-99m-labeled diphosphonates.', 'role': 'assistant'}]