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 all except - \nSelect and explain. \nA. Seminoma, B. Meningioma, C. Pappilary carcinoma of thyroid, D. Pappillary serous cystadenocarcinoma of the ovary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Psammoma bodies represent a process of dystrophic calcification.\nSingle necrotic may constitute\xa0seed crystals that become encrusted by the mineral deposits. The\xa0progressive acquisition\xa0of outer layers may create lamellated configurations, called psammoma bodies\xa0because of their resemblance to grains of sand.\nPsammoma bodies are seen in :\n\n\nPapillary cancer of the thyroid\nMeningioma\nPapillary serous cystadenocarcinoma of the ovary', 'role': 'assistant'}]