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': 'Mostly granulosa cell tumors are benign. Marker for granulosa cell tumor is: \nSelect and explain. \nA. CA 19-9, B. CA 50, C. Inhibin, D. Teratoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Granulosa Cell Tumor: Most are benign; however, between 5 and 25% are malignant. The tumors can produce estrogen, thus leading to endometrial hyperplasia and cancer. Microscopic morphology of granulosa cell tumor shows Call-Exner bodies (appear similar to ovarian follicle), and produce inhibin, which can be identified in serum and by immunohistochemistry. Ref: Wyatt C., Moos P.J., Brown T.G. (2008). Chapter 17. Pathology of the Male and Female Reproductive Tract and Breast. In C. Wyatt, P.J. Moos, T.G. Brown (Eds), Pathology: The Big Picture.', 'role': 'assistant'}]