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': 'The combined oral contraceptive pills decrease the risk of the following except : \nSelect and explain. \nA. Endometrial cancer, B. Ovarian cancer, C. Ectopic pregnancy, D. Breast cancer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Breast cancer', 'role': 'assistant'}]