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: Ans is B ie calcitonin Schwaz Surgery writes ? The presence of amyloid is a diagnostic finding, but immunohistochemistry for calcitonin is more commonly used as a diagnostic tumor marker. These tumors also stain positive for CEA (Carcinoembryonic antigen) and CGRP (Calcitonin gene-related peptide)"