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
[{'content': 'Acute exacerbation of COPD is done by all except: \nSelect and explain. \nA. Pneumococcus, B. Moraxella catarrhalis, C. H. influenza, D. Staph. aureus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bacterias like Pneumococcus , Moraxella catarrhalis are implicated in exacerbation of COPD.', 'role': 'assistant'}]