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
[{'content': 'True about Brenner tumor:a) Usually bilateralb) Resembles fibromac) Accounts for 20% of all ovarian tumorsd) Common in postmenopausal age group \nSelect and explain. \nA. c, B. bd, C. ab, D. ac', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Brenner tumour is also called as Transitional cell tumour:\n• It is a rare epithelial neoplasm of ovary resembling fibroma.\n• It is an essentially benign tumour.\n• Tumour is generally seen in women around menopause and is generally unilateral.\n• Cause menopausal bleeding and Pseudomeig syndrome (ascites and hydrothorax).\n• Malignant change is very rare.\n• Histologically it shows walthard cell rests of transitional cellsQ, cells have coffee bean nuclei, cut section is gritty.', 'role': 'assistant'}]