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': 'True about border line ovarian tumors is all except \nSelect and explain. \nA. Approximately 10 % of epithelial tumors of ovary are classified as borderline tumors., B. High rate of recurrence following surgery., C. Well differentiated tumors., D. Do not invade the basement membrane.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Borderline ovarian tumors do not often recurr following initial surgery.', 'role': 'assistant'}]