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: Surgery
[{'content': 'Radioiodine ablation is preferred in \nSelect and explain. \nA. Pregnancy, B. Graves disease, C. Young patients, D. Post surgery papillary carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Surgery is followed by RIA if thyroid tissue is left.\nI131 is used which has a half life of 8 days.', 'role': 'assistant'}]