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': 'Trachea is lined by - \nSelect and explain. \nA. Stratified squamous epithelium, B. Ciliated columnar epithelium, C. Simple columnar epithelium, D. Pseudostratified columnar epithelium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]