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
Aerial blood gas analysis of a patient reveals pH 7.2, HCO3 36mmol/L, pCO2 60mm of Hg. The abnormality is : 
Select and explain. 
A. Respiratory acidosis with compensatory metabolic alkalosis, B. Respiratory acidosis, C. Respiratory alkalosis with compensatory metabolic acidosis, D. Respiratory acidosis with compensatory metabolic acidosis
B: Respiratory acidosis
Answer: B: Respiratory acidosis 
Explanation: Answer B (Respiratory acidosis)