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
Drug of choice for bacterial vaginosis: March 2011 
Select and explain. 
A. Ciprofloxacin, B. Doxycycline, C. Teracycline, D. Metronidazole
D: Metronidazole
Answer: D: Metronidazole 
Explanation: Ans. D: Metronidazole The 7-day course of metronidazole 500 mg twice daily is effective in 85% of courses of bacterial/ gardnerella vaginosis, whereas a single dose of 2 gm cures only 45%.