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 patie-tt has undergone total thyroidectomy for papillary carcinoma of thyroid. Marker for follow-up of such a patient is: March 2011 \nSelect and explain. \nA. Thyroglobulin, B. Calcitonin, C. TSH, D. Serum iodine levels', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: ThyroglobulinThe measurement of serum thyroglobulin is of value in the follow-up and detection of metastatic disease in patients who have undergone surgery for differentiated thyroid carcinomaDifferentiated thyroid carcinoma includes follicular and papillary neoplasmsThyroid carcinoma which is:MC type: PapillaryLeast common type: AnaplasticBest prognosis: PapillaryWorst prognosis: AnaplasticDeveloping in thyroglossal cyst: PapillarySpreading by lymphatics: PapillaryPsammoma bodies: PapillaryLeast malignant: PapillaryHuhle cell variant: FollicularArising from parafollicular/ C cells: MedullaryAssociated with MEN II: MedullarySecrete calcitonin: MedullaryAssociated with RET proto-oncogene: Medullaryy', 'role': 'assistant'}]