This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Acute Lung Injury (ALI) is characterized by all except \nSelect and explain. \nA. PaO2/FiO2 < 200mm Hg, B. Bilateral interstitial infiltrates, C. PCWP <18 mm Hg, D. Normal Left atrial pressure', 'role': 'user'}, {'content': "Answer: A \nExplanation: Acute lung injury (ALI) is a less severe disorder but has the potential to evolve into ARDS. The aerial PaO2 (in mmHg)/FIO2 (inspiratory O2 fraction) <200 mmHg is characteristic of ARDS, while a PaO2/FIO2 between 200 and 300 identifies patients with ALI who are likely to benefit from aggressive therapy.Ref: Harrison's 18/e p2205, 17/e p1680", 'role': 'assistant'}]