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: Pathology
Medullary ca of thyroid is associated with increase in - 
Select and explain. 
A. Calcitonin, B. Thyroglobulin, C. T
3, D. T
4
A: Calcitonin
Answer: A: Calcitonin 
Explanation: The cells of medullary carcinomas, similar to normal 'C' cells, secrete calcitonin.
In some instance other hormones are secreted such as somatostatin, serotonin, and VIP.