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': 'Psammoma bodies are seen in the following except ? \nSelect and explain. \nA. Serous cystadenoma of ovary, B. Mucinous cysadenoma of ovary, C. Meningioma, D. Papillary carcinoma of thyroid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Mucinous cysadenoma of ovary", 'role': 'assistant'}]