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
Which bone scan is done to detect metastasis of bone is 
Select and explain. 
A. Tc 99 diphosphonate, B. Th201, C. Tc 99 DMSA, D. Tc 99 sulphur colloid
A: Tc 99 diphosphonate
Answer: A: Tc 99 diphosphonate 
Explanation: Bone scan is performed with technetium-99m-labeled diphosphonates.