Hyaline cartilage of respiratory tree extends up to:: (A) Tertiary bronchiole, (B) Secondary bronchiole, (C) Terminal bronchiole, (D) Bronchi
Answer is D. 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.