This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumonia, Subject name: Medicine
[{'content': 'Which organism is most likely to be associated with VAP? \nSelect and explain. \nA. Acinetobacter, B. Klebsiella, C. Clostridium, D. MTB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The leading cause of Ventilator associated pneumonia(VAP) - MDR pathogens is :- Pseudomonas aeruginosa > MRSA> Acinetobacter. NON -MDR pathogen is :- Streptococcus Pneumoniae> Hemophilus influenzae.', 'role': 'assistant'}]