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
In Medullary Carcinoma thyroid Tumour marker is- 
Select and explain. 
A. TSH, B. Calcitonin, C. T3, T4 and TSH, D. Alpha Feto protein
B: Calcitonin
Answer: B: Calcitonin 
Explanation: None