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
Which of the following is true about medullary CA of thyroid 
Select and explain. 
A. Associated with MET oncogene, B. Elevated levels of Serum calcitonin, C. Seen in MEN I syndrome, D. Most common thyroid cancer
B: Elevated levels of Serum calcitonin
Answer: B: Elevated levels of Serum calcitonin 
Explanation: 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