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': 'Oral contraceptive pills do not decrease risk of : \nSelect and explain. \nA. STDs, B. Benign breast disease, C. Ovarian cyst, D. Ectopic pregnancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: STDs', 'role': 'assistant'}]