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: Physiology
True regarding vascularity of lung is 
Select and explain. 
A. Hypoxia causes vasodilation, B. Pulmonary resistance is half of the systemic vascular resistance, C. Perfusion is more in the apical lobe than in base, D. Distended pulmonary veins in the lower lobe
D: Distended pulmonary veins in the lower lobe
Answer: D: Distended pulmonary veins in the lower lobe 
Explanation: In lungs, the lower lobes get perfused more due to the effect of gravity. So the lower lobe vessels are more distended.