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: Social & Preventive Medicine
[{'content': 'All are non contraceptive advantages of oral contraceptive pills except \nSelect and explain. \nA. Pelvic inflammatory disease, B. Hepatic adenoma, C. Benign breast cancer, D. Anemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]