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
Hyaline cartilage of respiratory tree extends up to: 
Select and explain. 
A. Tertiary bronchiole, B. Secondary bronchiole, C. Terminal bronchiole, D. Bronchi
D: Bronchi
Answer: D: Bronchi 
Explanation: Hyaline cartilage extends till the bronchi and are absent (or scatteredly present) distally in the bronchioles.
Goblet cells also extend till bronchus level; beyond that they are present scatteredly.