This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Calcitonin is a marker of - \nSelect and explain. \nA. Prostate cancer, B. Medullary carcinoma of thyroid, C. Pheochromocytoma, D. Pancreatic cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Harshmohan textbook of pathology 7th edition. medulla carcinoma is a less frequent type derived from para follicular or C cells present in the thyroid. Like normal C cells tumor cells of medullary carcinoma secrete calcitonin the hypo calcimic hormone. So calcitonin is an impoant tumor marker of medullary carcinoma of thyroid. .', 'role': 'assistant'}]