This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
ARDS is due to defect in 
Select and explain. 
A. A. Hypoxemia, B. B. Hypotention, C. C. Clara cells, D. D. Endothelial cells
D: D. Endothelial cells
Answer: D: D. Endothelial cells 
Explanation: ALI/ARDS is initiated by injury of pneumocytes and pulmonary endothelium. Setting in motion a vicious cycle of increasing inflammation and pulmonary damage