This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
[{'content': 'Tumor marker for medullary carcinoma of thyroid is: \nSelect and explain. \nA. Albumin, B. TSH, C. Thyroglobulin, D. Calcitonin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) CalcitoninRef: Bailey and Love 26th ed. ch. 51 / 764* Medullary thyroid cancer is a rare form of thyroid cancer and accounts for 3 to 10% of all thyroid cancers. It grows from specialized thyroid cells called parafollicular cells.* Parafollicular cells-C-cells; specialized thyroid cells that secrete calcitonin and play a major role in diagnosis of medullary thyroid cancer.', 'role': 'assistant'}]