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2012.07.25 Quiz: Microbiological Preliminary Results

In the Microbiology Round, the microbiologist tells you that the preliminary result of the endotracheal aspirate shows some gram-negative bacillus which belongs to the Enterobacteriaceae family, and is a lactose fermenter. What is this bacterium?
A. Acinetobacter
B. Klebsiella pneumoniae
C. Pseudomonas aeruginosa
D. Stenotrophomonas maltophilia
E. Proteus mirabilis