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
[{'content': 'Vaginal Ph in women of the reproductive age group is within which of the following range? \nSelect and explain. \nA. 4-4.5, B. 7-Jun, C. 8-Jul, D. 3-Jan', 'role': 'user'}, {'content': "Answer: A \nExplanation: The healthy vagina of a woman of child-bearing age is acidic, with a pH normally ranging between 3.8 and 4.5. This is due to the degradation of glycogen to the lactic acid by enzymes secreted by the Doderlein's bacillus. This is a normal commensal of the vagina. The acidity retards the growth of many strains of dangerous microbes.", 'role': 'assistant'}]