Medicine Most common cause of hypercapnic respiratory failure: March 2011,’Parch 2013 (a, b, h) A Acute asthma B Aspergillosis C COPD D Pneumothorax 💡 Explanation Most common cause of hypercapnic respiratory failure: March 2011,'Parch 2013 (a, b, h) ✓ Correct Answer: C. COPD