This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiation treatment planning, Subject name: Radiology
The radioisotope used for ablation of thyroid gland is 
Select and explain. 
A. Iodine 123, B. Iodine 125, C. Iodine 131, D. Technetium 99 pertechnate
C: Iodine 131
Answer: C: Iodine 131 
Explanation: Ans. (c) Iodine 131Sutton 7th/1504