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': 'Feature of shock lung is \nSelect and explain. \nA. Diffuse alveolar damage, B. Usual interstitial infiltrates, C. Organizing pneumonia, D. Bronchiolitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In ARDS, the presence of alveolar and interstitial fluid and the loss of surfactant can lead to a marked reduction of lung compliance. Without an increase in end-expiratory pressure, significant alveolar collapse can occur at end-expiration,with consequent impairment of oxygenation. Ref Davidson edition23rd pg 199', 'role': 'assistant'}]