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: Gynaecology & Obstetrics
[{'content': 'Surgical staging is required in which of the following sex cord stromal tumor \nSelect and explain. \nA. Granulosa cell tumor, B. Gynandroblastoma, C. Sertoli - leydig cell tumor (well differentiated), D. Thecoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Surgical staging is required in\n\nGranulosa cell tumor\nFibrosarcoma\xa0\nSertoli - Leydig cell tumor (intermediate and poorly differentiated)\nSex-cord stromal tumor with annular tubules (independent of peutz-Jeghers syndrome)', 'role': 'assistant'}]