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': 'Drug of choice in bacterial vaginosis is : \nSelect and explain. \nA. Metronidazole, B. Doxycycline, C. Clindamycin, D. Ciprofloxacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metronidazole', 'role': 'assistant'}]