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
Risk factors for malignant transformation of endometrial polyp are all except 
Select and explain. 
A. Large polyp > 1.5 cm size, B. Abnormal uterine bleeding, C. Use of tamoxifen, D. Use of oral contraceptive.
D: Use of oral contraceptive.
Answer: D: Use of oral contraceptive. 
Explanation: Use of oral contraceptives do not pose risk of malignant transformation of endometrial polyp.