This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'Treatment of Medullary Ca of thyroid with lymph node metastasis \nSelect and explain. \nA. Sub total thyroidectomy + Radioiodine + TSH supression, B. Subtotal thyroidectomy + Radiotherapy, C. Total thyroidectomy + Radioiodine, D. Total thyroidectomy + Radiotherapy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .In medullary carcinoma thyroid , total thyroidectomy is treatment of choice. Radiotherapy can be considered in unresectable cases or after complete surgical resection in few cases. Note : Since medullary thyroid cancer doesnot arise from follicular cells, TSH suppression and RAI (radio active iodine) therapy have no role. Source : Sabiston 20th edition pg 910', 'role': 'assistant'}]