This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Failure, Subject name: Medicine
In type II respiratory failure there is: 
Select and explain. 
A. Low pO2 and Low pCO2, B. Low pO2 and High pCO2, C. Normal pO2 and High pCO2, D. Low pO2 and Normal pCO2
B: Low pO2 and High pCO2
Answer: B: Low pO2 and High pCO2 
Explanation: Type I respiratory failure Type II respiratory failure Low pO2 Low pO2 Normal or low pCO2 High pCO2 A-a gradient is increased A-a gradient is normal because Hypoventilation leads to reduction of both pAO2 and paO2