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: ENT
The nasopharynx is lined by which epithelium 
Select and explain. 
A. Stratified squamous non-keratinized, B. Ciliated columnar, C. Stratified squamous keratinized, D. Cuboidal
B: Ciliated columnar
Answer: B: Ciliated columnar 
Explanation: 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 (pharyngobasilar fascia).
3. Muscular coat: 2 layers
External layer :
- superior, middle, and inferior constrictors.
​​Internal layer :
- stylopharyngeus, salpingopharyngeus and palatopharyngeus muscle.
4. Buccopharyngeal fascia.