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
[{'content': 'Paranasal sinuses are lined by____ epithelium: \nSelect and explain. \nA. Ciliated columnar, B. Columnar, C. Cuboidal, D. Squamous', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]