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
Most common abnormality associated with ARDS 
Select and explain. 
A. Hypoxemia, B. Hypercapnea, C. Diffuse alveolar damage, D. Bilateral alveolar infiltrates
A: Hypoxemia
Answer: A: Hypoxemia 
Explanation: The most common feature associated with ARDS is hypoxaemia,i.e.,the aerial Po2(mm Hg)/FIo2 (inspiratory O2 fraction) Reference:Harrison's Medicine- 20edition,page no:2031