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: Medicine
Which one of the following is not a feature of type 2 respiratory failure ? 
Select and explain. 
A. p CO2 38 mm Hg and pO2 50 mm HG, B. p CO2 68 mm Hg and pO2 50 mm Hg, C. Papilloedema, D. Asterixis
A: p CO2 38 mm Hg and pO2 50 mm HG
Answer: A: p CO2 38 mm Hg and pO2 50 mm HG 
Explanation: None