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: Pharmacology
[{'content': 'In treatment of Papillary Carcinoma thyroid, Radioiodine destroys the neoplastic cells predominantly by- \nSelect and explain. \nA. X rays, B. b rays, C. g rays, D. a paicles', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., b rays", 'role': 'assistant'}]