This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchopulmonary Segments, Embryonic veins, Subject name: Anatomy
Bronchial aery supplies lungs up to: 
Select and explain. 
A. Teiary bronchioles, B. Respiratory bronchiole, C. Alveolar ducts, D. Terminal bronchiole
B: Respiratory bronchiole
Answer: B: Respiratory bronchiole 
Explanation: Bronchial aeries carry oxygen to tracheobronchial tree and lung parenchyma and supplies till the level of respiratory bronchiole. Pulmonary aeries alone vascularize the fuher distal pathways, including alveolar ducts and the alveoli.