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': 'Sections from a solid-cystic unilateral ovarian tumor in a 30-year old female show a tumor composed of diffuse sheets of small cells with doubtful nuclear grooving and scanty cytoplasm. No C -Exner bodies are seen. The ideal immunohistochemistry panel would include - \nSelect and explain. \nA. Vimentin, epithelial membrane antigen, inhibin, CD99, B. Desmin, S-100 protein, smooth muscle antigen, cytokeratin, C. Chromogranin, CD45, CD99, CD20, D. CD3, chromagranin, CD 45, synaptophysin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: This patient is having granulosa cell tumor of the ovary which is characterized histologically by :\n\nDiffuse sheets of round and oval cells \xa0 \xa0\xa0\nInconspicuous groove and folds in nuclei - coffee bean appearance\nScant cytoplasm\n\n\nGranulosa cell tumor is positive for →\n\n(i) Vimentin,\xa0(ii) Inhibin,\xa0(iii) CD99\n\nEpithelial membrane antigen is positive in surface epithelial tumor.', 'role': 'assistant'}]