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: Radiology
Radio-isotope of iodine used for thyroid tissue destruction: March 2011 
Select and explain. 
A. I-123, B. I-125, C. I-131, D. I-132
C: I-131
Answer: C: I-131 
Explanation: Ans. C: I-131 I-131 is used as Nat in the diagnosis and treatment of thyroid disease