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': 'Amyloid stroma is seen in - \nSelect and explain. \nA. Papillary ca. thyroid, B. Follicular ca. thyroid, C. Anaplastic ca. thyroid, D. Medullary ca. thyroid', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Medullary Ca. thyroid", 'role': 'assistant'}]