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
[{'content': 'Medullary ca of thyroid is associated with increase in - \nSelect and explain. \nA. Calcitonin, B. Thyroglobulin, C. T\n3, D. T\n4', 'role': 'user'}, {'content': "Answer: A \nExplanation: The cells of medullary carcinomas, similar to normal 'C' cells, secrete calcitonin.\nIn some instance other hormones are secreted such as somatostatin, serotonin, and VIP.", 'role': 'assistant'}]