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: Unknown
Bronchial arteries supply the lung up to - 
Select and explain. 
A. Major bronchi, B. Alveolar duct, C. Tertiary bronchi, D. Respiratory bronchioles
D: Respiratory bronchioles
Answer: D: Respiratory bronchioles 
Explanation: Ans. is 'd' i.e., Respiratory bronchioles o Bronchial arteries supply the lung till the beginning of respiratory bronchiole (conducting part) and then anastomose with pulmonary arteries.