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
[{'content': 'In a splenectomized patient, there is an increase of infection by all the organisms except - \nSelect and explain. \nA. Pneumococci, B. Klebsiella, C. H. influnzae, D. Staph. aureus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]