This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
[{'content': 'Treatment of medullary Ca thyroid is: \nSelect and explain. \nA. Total thyroidectomy only, B. Total thyroidectomy + Radical neck dissection, C. Total thyroidectomy + Radio Iodine Therapy, D. Total thyroidectomy + prophylactic CND', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Total thyroidectomy + Prophylactic Central Neck Node dissection (CND)Ref: Schwartz 10th Edition Page 1549* Routine Central neck node dissection must be done for Medullary cancers of Thyroid.', 'role': 'assistant'}]