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: Medicine
Autopsy of lung of an old man shows that the bronchi are lined by stratified squamous epithelium. What is this change 
Select and explain. 
A. Metaplasia, B. Dysplasia, C. Hyperplasia, D. Hypertrophy
A: Metaplasia
Answer: A: Metaplasia 
Explanation: None