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
The following condition is not associated with an increased anion-gap type of metabolic acidosis : 
Select and explain. 
A. Shock, B. Ingestion of ante-freeze, C. Diabetic keto-acidosis, D. COPD
D: COPD
Answer: D: COPD 
Explanation: Answer is D (COPD) In COPD Blood pH is usually maintained within normal range in spite of increased PaCO2 because of renal compensation which leads to retention of bicarbonates - API/6th/232