This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ovarian Tumors and Vulvar cancer, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common malignancy of Ovary is: \nSelect and explain. \nA. Granulosa cell tumour, B. Dermoid cyst, C. Mucinous cystadenoma, D. Serous cystadenoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ovarian tumors Epithelial cell tumor Germ cell tumor Sex cord tumor M/C tumor (90%) 5-8% 3% Types: Serous (75-80%) (M/C) Endometrial (8-10%) Mucinous (5%) Clear cell Brenner tumors Teratoma Yolk sac tumor Endodermal Sinus tumor Choriocarcinoma Dysgerminoma Dermoid cyst A. Estrogen Secreting tumors Granulosa cell Fibroma Thecoma B. Androgen secreting Tumor Seoli cell tumor Leydig cell Hilus cell tumor', 'role': 'assistant'}]