This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Gynaecology & Obstetrics
What is the drug of choice of Bacterial vaginosis in pregnancy 
Select and explain. 
A. Metronidazole, B. Clindamycin, C. Erythromycin, D. Rovamycin
A: Metronidazole
Answer: A: Metronidazole 
Explanation: BV is a maldistribution of normal vaginal flora Lactobacilli are decreased, and Anaerobic bacteria species are overrepresented. Anaerobes include Gardnerella, Prevotella, Mobiluncus, and Bacteroides species; Atopobium vaginae; BV-associated bacteria, provisionally named BVAB1, BVAB2, and BVAB3. Pregnancy -DOC - Metronidazole 500 mg twice daily orally for 7 days; 0.75-percent gel, intra-vaginally, daily for 5 days Clindamycin 2% One applicator intra-vaginally nightly for 7 days. 300 mg orally twice daily for 7 days 100-mg clindamycin ovules Vaginally nightly for 3 days