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 upto- \nSelect and explain. \nA. Tertiary bronchiole, B. Secondary bronchiole, C. Terminal bronchiole, D. Bronchi', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The trachea and bronchi have cartilage (hyaline cartilage) in their walls but relatively little smooth muscles.\nThe walls of bronchiole and terminal bronchioles do not contain cartilage instead, they contain more smooth muscles.', 'role': 'assistant'}]