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: Anatomy
[{'content': 'Mucous glands are absent in - \nSelect and explain. \nA. Cervix, B. Esophagus, C. Vagina, D. Duodenum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The wall of the vagina consists of a mucous membrane, a muscle coat and an outer fibrous coat or adventitia.\nThe mucous membrane is lined by Stratified squamous epithelium. The epithelial cells are rich in glycogen. No glands are seen in the mucosa, the vaginal surface being kept moist by secretions of glands in the cervix.\nAt the upper and lower ends of the esophagus, some tubulo-alveolar mucous glands are present in the lamina propria.', 'role': 'assistant'}]