This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiology Q Bank, Subject name: Radiology
Radioisotope(s) preferred for management of bone metastasis is/are? 
Select and explain. 
A. I-131, B. Iridium 192, C. Sr-89, D. Co-60
C: Sr-89
Answer: C: Sr-89 
Explanation: Sr-89 Radioisotope,a beta Emitter used in the palliation of painful Bone metastasis It is metabolised similar to calcium and targets the metabolically active regions of the bone It has a half life of 50.5 Days