This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enterobecteriaceae, Subject name: Microbiology
Which of the following bacterium is non-motile? (D. REPEAT 2013) 
Select and explain. 
A. Klebsiella spp., B. Citrobacter spp., C. Escherichia spp., D. Salmonella spp.
A: Klebsiella spp.
Answer: A: Klebsiella spp. 
Explanation: Ref: Colour Atlas and Textbook of Medical Microbiology. Elmer W Koneman, 5th edition, Page 195Explanation:Please note that all the bacteria asked in the options are members of the Enterobacteriaceae.Here is a list of enterobacteriaceae members with their motilitv.Motile Enterobacteriaceae aceae membersNon-motile Enterobacteri- membersEscherichia col iShigella spp.Edwardsiella tardaKlebsiella spp.Salmonella spp.Yersinia pestisCitrobacter spp.(Mnemonic: SKY )Enlerobacter spp. Hafnia Panloea Proteus spp. Morganella Providencia spp. Organisms with different motility at two different temperatures:o Enterobacteriaceae member - Yersinia enterocolitica.o Non-enterobacteriaceae member - Listeria monocytogenes.