This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Most common ovarian malignancy in post menopausal period is \nSelect and explain. \nA. Serous cystadenoma, B. Fibroma/thecoma, C. Teratoma, D. Mucinous tumor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans a Ref: Sheila balakrishnan page 256Epithelial tumor: Majority are seen in post menopausal woman, peak incidence between 50-60.30-40:peak incidence of borderline tumorsLess common under 40 yrsMost common epithelial tumor is serous cystadenoma followed by mucinous.Sex cord stromal tumors: can occur at all ages Germ cell tumors: common among children, young adults', 'role': 'assistant'}]