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': 'Dysgerminoma is \nSelect and explain. \nA. Epithelial ovarian tumor, B. Sex cord stromal tumor, C. Germ cell tumor, D. Metastatic ovarian tumor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dysgerminoma is germ cell tumor of ovary.', 'role': 'assistant'}]