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': 'Hyaline cartilage of respiratory tree extends up to: \nSelect and explain. \nA. Tertiary bronchiole, B. Secondary bronchiole, C. Terminal bronchiole, D. Bronchi', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hyaline cartilage extends till the bronchi and are absent (or scatteredly present) distally in the bronchioles.\nGoblet cells also extend till bronchus level; beyond that they are present scatteredly.', 'role': 'assistant'}]