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
Most impoant pathogen causing pneumonia in a patient with bronchiectasis is: 
Select and explain. 
A. Streptococcus pneumoniae, B. Oral anaerobes, C. Acinetobacter spp, D. Staphylococcus aureus
D: Staphylococcus aureus
Answer: D: Staphylococcus aureus 
Explanation: Impoant pathogen causing pneumonia in a patient with bronchiectasis 1. P. aeruginosa 2. Burkholderia cepacia 3. Staphylococcus aureus All others in the list are causing pneumonia in chronic alcoholic patients Ref: Harrison, E-18, P-2132.