This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carcinoma Ovary, Subject name: Gynaecology & Obstetrics
[{'content': 'M/C ovarian tumor in a 15-year-old female: \nSelect and explain. \nA. Sex cord tumor, B. Metastatic tumor, C. Germ cell tumor, D. Epithelial tumor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c, i.e. Germ cell Tumor.Ref: Williams Gynae 3rd/ed, p761"GCT- These tumors are the most common ovarian malignancy diagnosed during childhood and adolescence, although only 1% of all ovarian cancers develop in these age groups. At age 20, however, the incidence of epithelial ovarian cancer begins to rise & exceeds that of germ cell tumors." - Ref Williams Gynae 3rd/ed, p761', 'role': 'assistant'}]