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: Pathology
The following is not characterstic of ARDS ? 
Select and explain. 
A. Dyspnoea, B. Ability to maintain Pa02 on 100% oxygen, C. Bilateral crepts, D. Bilateral opacities on X-ray
B: Ability to maintain Pa02 on 100% oxygen
Answer: B: Ability to maintain Pa02 on 100% oxygen 
Explanation: Ans. is 'b' i.e., Ability to maintain PaO, on 100% oxygen