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
Which of the following statements is true regarding thyroglobulin? 
Select and explain. 
A. It is a specific marker for anaplastic carcinoma, B. Elevation after complete therapy suggests recurrence in well-differentiated thyroid malignancies, C. Preoperative elevation always suggests thyroidal disease, D. Intra op estimation from thyroid veins is very useful for prognosis
B: Elevation after complete therapy suggests recurrence in well-differentiated thyroid malignancies
Answer: B: Elevation after complete therapy suggests recurrence in well-differentiated thyroid malignancies 
Explanation: None