This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
[{'content': 'The nasopharynx is lined by which epithelium? \nSelect and explain. \nA. Stratified squamous nonkeratinized, B. Stratified squamous keratinized, C. Ciliated columnar, D. Cuboidal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The pharyngeal wall consists of 4 layers from within outwards 1. Mucous membrane: Epithelium is ciliated columnar in the nasopharynx and stratified squamous elsewhere 2. Pharyngeal aponeurosis (pharyngo basilar fascia ) 3. Muscular coat: 2 layers External layer - superior, middle, and inferior constrictors Internal layer - stylopharyngeus, salpingopharyngeus and palatopharyngeus muscle 4. Buccopharyngeal fascia (Ref: Diseases of ENT, PL Dhingra, 7th Edition, pg no.271)', 'role': 'assistant'}]