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': 'All of the following are true about vagina except \nSelect and explain. \nA. Direction of vagina is parallel to plane of brim of true pelvis., B. Posterior wall is 11.5 cm and anterior wall is 9 cm long, C. Vaginal mucosa is lined by keratinized squamous epithelium, D. No glands open into vagina', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vaginal mucosa is lined by non-keratinized squamous epithelium.', 'role': 'assistant'}]