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: Microbiology
Most common species of pseudomonas causing intravascular catheter related infections is ? 
Select and explain. 
A. P. cepacia, B. P. aeruginosa, C. P. maltophilia, D. P. mallei
B: P. aeruginosa
Answer: B: P. aeruginosa 
Explanation: Pseudomonas aeruginosa is most troublesome agent of nosocomial infections