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
Which of the following is known to decrease recurrence rate of bacterial vaginosis 
Select and explain. 
A. Treatment of male sexual partner, B. Introduction of lactobacilli, C. Acidifying vaginal gels, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: There is no effective treatment to reduce recurrence rate of bacterial vaginosis.