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
In cystic fibrosis, pseudomonas aeroginosa is most common arganism. The next most common is 
Select and explain. 
A. Steptococci, B. Klebsiella, C. Pnuemococci, D. Staphylococcus aureus
D: Staphylococcus aureus
Answer: D: Staphylococcus aureus 
Explanation: None