This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which of the following is used in the treatment of differentiated thyroid cancer 
Select and explain. 
A. 131I, B. 99mTc, C. 32P, D. 131I-MIBG
A: 131I
Answer: A: 131I 
Explanation: 131I can be used for scanning for metastasis from differentiated thyroid cancers as well as for the ablation of differentiated thyroid cancer cells.