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
Ovarian tumours are commonly arise from : 
Select and explain. 
A. Stroma, B. Surface epithelium, C. Germinal epithelium, D. Endoderm
B: Surface epithelium
Answer: B: Surface epithelium 
Explanation: Surface epithelium