This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
Ovarian fibroma develops from 
Select and explain. 
A. Epithelium, B. Germ cells, C. Sex cord, D. Stroma
D: Stroma
Answer: D: Stroma 
Explanation: Histologically fibroma has a cellular or myxomatous stroma which are scattered large signet ring cells. Ref: Shaw Gynecology 17 e pg 464.