This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
Ovarian tumours are commonly arise from 
Select and explain. 
A. Stroma, B. Surface epithelium, C. Germinal epithelium, D. Endodermal
B: Surface epithelium
Answer: B: Surface epithelium 
Explanation: (Surface epithelium) (397-S) (333-S14th)Ovarian cancers* Epithelial ovarian cancers accounts for 80 to 90% of ovarian cancers* Non-epithelial cancers account for 10 to 20%These include malignancies of:I) Germ cell originII) Sex cord stromal cell originIII) Metastatic cancersIV) Rare malignancies like lipoid cell tumours sarcomas