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: Microbiology
Normal commensal in female genital tract - 
Select and explain. 
A. Gardnerella vaginalis, B. Bifidobacteria, C. Proteus, D. Neisseria
A: Gardnerella vaginalis
Answer: A: Gardnerella vaginalis 
Explanation: None