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': 'A patient diagnosed with papillary carcinoma of thyroid underwent whole body iodine scan 6 weeks after surgery, which revealed residual disease. Next best step is : \nSelect and explain. \nA. Surgical removal of residual disease, B. User neck + Serum thyroglobulin level, check for, C. Radioiodine ablation, D. FNAC of the residual tissue F/B radioiodine ablation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Post operative follow up protocol.', 'role': 'assistant'}]