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: Unknown
Which of the following defines ARDS all except ? 
Select and explain. 
A. PaO2/FiO2<300, B. Acute onset, C. Bilateral alveolar infiltrates, D. PCWP>18 mm Hg
D: PCWP>18 mm Hg
Answer: D: PCWP>18 mm Hg 
Explanation: Ref. API Textbook of Medicine. Pg. 259