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
[{'content': 'Radio-isotope of iodine used for thyroid tissue destruction: March 2011 \nSelect and explain. \nA. I-123, B. I-125, C. I-131, D. I-132', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: I-131 I-131 is used as Nat in the diagnosis and treatment of thyroid disease', 'role': 'assistant'}]