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': 'Use of oral contraceptives decreases the incidence of all of the following except: \nSelect and explain. \nA. Ectopic pregnancy, B. Epithelial ovarian malignancy, C. Hepatic adenoma, D. Pelvic inflammatory disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]