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
[{'content': 'Ovarian fibroma develops from \nSelect and explain. \nA. Epithelium, B. Germ cells, C. Sex cord, D. Stroma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Histologically fibroma has a cellular or myxomatous stroma which are scattered large signet ring cells. Ref: Shaw Gynecology 17 e pg 464.', 'role': 'assistant'}]