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
[{'content': 'On an ABG, pH of 7.2, pO2 of 46, pCO2 of 80 are indicative of: \nSelect and explain. \nA. Acute exacerbation of COPD, B. Adult respiratory distress syndrome, C. Interstitial pneumonitis, D. Acute asthma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ABG shows severe hypoxia with hypercarbia with acidosis suggestive of type 2 respiratory failure. ARDS and acute asthma both have Type 1 Respiratory Failure and are ruled out. So we have to select between options A and C. Interstitial Pneumonitis on routine presentation will not have such low oxygen values but an acute exacerbation of chronic bronchitis will definitely present with low oxygen values.', 'role': 'assistant'}]