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
Protective bacterium in normal vagina is: September 2012 
Select and explain. 
A. Peptostreptococcus, B. Lactobacillus, C. Gardenella vaginalis, D. E. coli
B: Lactobacillus
Answer: B: Lactobacillus 
Explanation: Ans. B i.e. Lactobacillus