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': 'Risk factors for malignant transformation of endometrial polyp are all except \nSelect and explain. \nA. Large polyp > 1.5 cm size, B. Abnormal uterine bleeding, C. Use of tamoxifen, D. Use of oral contraceptive.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Use of oral contraceptives do not pose risk of malignant transformation of endometrial polyp.', 'role': 'assistant'}]