Medicine In cystic fibrosis, pseudomonas aeroginosa is most common arganism. The next most common is A Steptococci B Klebsiella C Pnuemococci D Staphylococcus aureus 💡 Explanation In cystic fibrosis, pseudomonas aeroginosa is most common arganism. The next most common is ✓ Correct Answer: D. Staphylococcus aureus