This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'All of the following are true about Borderline tumors except : \nSelect and explain. \nA. 10% of all epithelial tumours are borderline., B. They have a good prognosis., C. Metastases are common, D. Absence of stromal invasion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The characteristic feature of borderline tumor of ovary are: - 10% of all epithelial tumours are borderline. - metastasis are uncommon but can rarely occur. - the chief characteristic feature is absence of stromal invasion. - confined to ovary for long time and have very good prognosis. Reference: Textbook of Gynaecology, Sheila balakrishnan, 2nd edition, pg no:272,273 <\\p>', 'role': 'assistant'}]