This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid, Subject name: Surgery
[{'content': 'Whole-body iodine scan after total thyroidectomy is not recommended for which thyroid cancer ? \nSelect and explain. \nA. Papillary thyroid cancer, B. Anaplastic thyroid cancer, C. Medullary thyroid cancer, D. Follicular thyroid cancer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Whole-body iodine scan is recommended for differentiated thyroid cancer , which fulfill following conditions : Tumors - between 1cm-4cm Confined to the thyroid Do not have nodal or distant metastasis, Adverse histologic subtype (tall cell) Vascular invasion. =Unlike differentiated thyroid cancer, Medullary thyroid carcinoma cells do not concentrate radioactive iodine and are not sensitive to manipulation of thyroid-stimulating hormone.', 'role': 'assistant'}]