This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Modes of Ventilation, Subject name: Anaesthesia
[{'content': 'The most common pathogen in ventilation associated pneumonia: \nSelect and explain. \nA. Staphylococcus Aureus, B. Pseudomonas, C. Enterococci, D. Streptococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Two most common pathogen FOR ventilator Asssociated Pneumonia - (1) Staph Aureus (2) Pseudomonas Aeruginosa Pseudomonas Aeruginosa is more common among two.', 'role': 'assistant'}]