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
In treatment of papillary carcinoma thyroid, radioiodine destroys the neoplastic cells predominantly by: 
Select and explain. 
A. X-rays, B. ri rays, C. 7 rays, D. a paicles
B: ri rays
Answer: B: ri rays 
Explanation: Ans. ri rays