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': '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: None', 'role': 'assistant'}]