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
[{'content': 'ARDS is due to a defect in: \nSelect and explain. \nA. Type I pnemocytes, B. Type2 pnemocytes, C. Clara cells, D. Endothelial cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ARDS is intiated by injury of pnemocytes and pulmonary endothelium setting in motion a viscious cycle of increasing inflammation and pulmonary damage.(ref Robbins 9th/672)', 'role': 'assistant'}]