This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Which one of the following is the best drug of choice for treatment of bacterial vaginosis during pregnancy? \nSelect and explain. \nA. Clindamycin, B. Metronidazole, C. Erythromycin, D. Rovamycine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment of bacterial vaginosis: Sensitive to metronidazole/clindamycin Metronidazole use in the first trimester - no human evidence of teratogenesis Topical therapy using vaginal gel is effective but may not reduce the risk of pre-term delivery. ref Katzung 12th ed', 'role': 'assistant'}]