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': 'Which of the following is true about medullary cancer thyroid? \nSelect and explain. \nA. MET gene Positive, B. Elevated levels of serum calcitonin+, C. MEN I syndrome associated, D. Most common thyroid cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Elevated levels of Serum calcitonin seenRef: Schwartz Page 1546/10th edition* Medullary cancer is associated with RET oncogene mutation.* MEN-2 Syndromes are associated with MTC* Most common thyroid cancer is Papillary cancer', 'role': 'assistant'}]