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
In type -II respiratory failure, there is 
Select and explain. 
A. Low p02 and low pCO2, B. Low p02 and high pCO2, C. Normal p02 and high pCO2, D. Low p02 and normal pCO2
B: Low p02 and high pCO2
Answer: B: Low p02 and high pCO2 
Explanation: Type ll respiratory failure occurs as a result of alveolar hypoventilation and results in the inability to eliminate carbon dioxide effectively.It can be caused by drug overdose,brainstem injury,hypothyroidism,myasthenia gravis,Guillain -Barre syndrome,electrolyte derangements,myopathy,etc.So there will be hypoxia and hypercapnia. Ref:Harrison's medicine-18th edition,page no:2200.