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': 'Treatment of Medullary carcinoma of thyroid is \nSelect and explain. \nA. Surgery and Radiotherapy, B. Radiotherapy and Chemotherapy, C. Surgery only, D. Radioactive ablation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Management Total thyroidectomy + Routine central lymph node dissection + ipsilateral modified radical node dissection (Tumor > 1cm) +- Bilateral modified Radical neck dissection (if any lymph node is positive) MCT - Poor prognosis (because it does not respond to radioactive iodine ablation) Vandetanib - Only FDA approved drug in advanced progressive medullary thyroid cancer.', 'role': 'assistant'}]