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 contraceptives increase risk of all except \nSelect and explain. \nA. Breast cancer, B. Ovarian cancer, C. Cervical cancer, D. Liver cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: OCPs have protective effect against endometrial and ovarian cancer.', 'role': 'assistant'}]