This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vigina, Subject name: Gynaecology & Obstetrics
[{'content': '6. Cause of acidic pH of vagina is due to? \nSelect and explain. \nA. Doderlein Bacilli, B. Gardnerella, C. Mobilincus, D. Glycogen', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Doderlein BacilliRef: Shaw 13thed p. 125, Novak's Gynecology 12th ed p-192, Jeff coate 7ed p-27", 'role': 'assistant'}]