This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Obstructive Pulmonary Disease, Subject name: Medicine
Which of the folio wing is the least com mon bacteria responsible for Acute Exacerbation of Chronic Bronchitis - 
Select and explain. 
A. Streptococcus pneumoniae, B. Moraxella catarrhalis, C. Haemophilus influenza, D. Staphylocccus aureus
D: Staphylocccus aureus
Answer: D: Staphylocccus aureus 
Explanation: .Ans. is 'd' i.e., Staphylocccus aureus Most common bacterias associated with acute excerbation in COPDo Hemophilus influenzao Moraxella catarrhaliso Streptococcus pneumoniae