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': 'Antibiotics recommended for treatment of bacterial vaginosis according to CDC include all except \nSelect and explain. \nA. Clindamycin, B. Erythromycin, C. Metronidazole, D. Tinidazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Erythromycin is not included in regimens for treatment of bacterial vaginosis.', 'role': 'assistant'}]