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: Surgery
[{'content': 'The most common cause of pulmonary abscesses in Cystic Fibrosis is? \nSelect and explain. \nA. Pseudomonas aeruginosa, B. Staphylococcus aureus, C. Burkholderia cenocepacia, D. Nontuberculous mycobacteria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pseudomonas aeruginosa REF: Mayo Clinic Internal Medicine Board Review 9th edition Page 845, Infectious diseases of the respiratory tract by Michael E. Ellis Page 511 "Pseudomonas aeruginosa is a ubiquitous organism commonly isolated from patients with cystic fibrosis and bronchiectasis"', 'role': 'assistant'}]