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
All of the following are true about Borderline tumors except 
Select and explain. 
A. 10% of all epithelial tumours are borderline., B. they have a good prognosis., C. Metastases are common, D. Absence of stromal invasion
C: Metastases are common
Answer: C: Metastases are common 
Explanation: None