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: Medicine
[{'content': 'Which of the following is the most characteristic feature of Adult Respiratory Distress Syndrome (ARDS): \nSelect and explain. \nA. Diffuse Alveolar Damage, B. Hypoxemia and Hypoxia, C. Surfactant Deficiency, D. Hypocapnia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Diffuse Alveolar Damage): Diffuse Alveolar Damage (DAD) is the histopathological hallmark of Acute Respiratory Distress Syndrome (ARDS) and the most characteristic feature amongst the options provided. Diffuse Alveolar Damage is often used as a synonym for ARDS. `The pathological hallmark of ARDS is Diffuse Alveolar Damage' - Thoracic Imaging (Thieme) 2010/Case 78 The histological hallmark of ARDS is Diffuse Alveolar Damage' - 'Intensive Critical Care Medicine' (Springer) 2009/210 Synonyms for ARDS Diffuse Alveolar Damage Shock Lung Blast Lung Traumatic Wet Lung Congestive Atelectasis Do Nang Lung Noncardiogenic Pulmonary Edema", 'role': 'assistant'}]