This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Paranasal sinuses are lined by____ epithelium: 
Select and explain. 
A. Ciliated columnar, B. Columnar, C. Cuboidal, D. Squamous
A: Ciliated columnar
Answer: A: Ciliated columnar 
Explanation: The paranasal sinuses are lined by the mucus membrane which is continuous with the mucosa of the nasal cavity through the ostia. It is a ciliated columnar epithelium having goblet cells which secrete mucus.