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': 'In perimenopausal women with menorrhagia we rule out all carcinoma except : \nSelect and explain. \nA. Ovary, B. Uterus, C. Fallopian tube, D. Endometrium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ovary', 'role': 'assistant'}]