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
[{'content': 'Amyloid deposition is seen in which type of carcinoma thyroid: September 2009 \nSelect and explain. \nA. Follicular, B. Anaplastic, C. Anaplastic, D. Medullary', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Medullary Medullary tumors have an ominous histologic pattern, with solid masses of cells with large vesicular nuclei. There may be considerable associated fibrosis, and deposits of amyloid are a helpful diagnostic point. These tumors are entities distinct from the undifferentiated cancers and medullary carcinomas have a much better prognosis. Medullary thyroid carcinoma (MTC) is associated with amyloid deposition in the surrounding tissues. Full-length calcitonin is the sole constituent of amyloid in MTC.', 'role': 'assistant'}]