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
[{'content': 'Which of the following is true about medullary CA of thyroid \nSelect and explain. \nA. Associated with MET oncogene, B. Elevated levels of Serum calcitonin, C. Seen in MEN I syndrome, D. Most common thyroid cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Elevated levels of Serum calcitoninIn Medullary carcinoma serum calcitonin is increased, whose function is to lower serum calcium levels.So hypocalcemia maybe found associated with MTC.Seen in MEN II A and BAssociated with RET Protooncogene', 'role': 'assistant'}]