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: Medicine
Diagnostic criteria for ARDS include all except 
Select and explain. 
A. Bilateral alveolar infiltrates, B. PaO2 / FiO2 >=300 mm Hg, C. Acute onset, D. Pulmonary capillary wedge pressure <= 18 mm Hg
B: PaO2 / FiO2 >=300 mm Hg
Answer: B: PaO2 / FiO2 >=300 mm Hg 
Explanation: Diagnostic Criteria for ARDSSeverity: OxygenationMild: Pao2/Fio2 300-2 00 mmHgModerate: Pao2/Fio2 200-100 mmHgSevere: Pao2/Fio2 <= 100 mmHgOnsetAcuteChest RadiographBilateral alveolar or interstitial infiltratesAbsence of Left Atrial HypeensionPCWP <=18 mmHg or no clinical evidence of increased left atrial pressureRef: Harrison 19e pg: 1736