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: Unknown
[{'content': 'Which of the following bacterium is non-motile? \nSelect and explain. \nA. Klebsiella spp, B. Citrobacter spp, C. Escherichia spp, D. Salmonella spp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: Anantha Narayanan and Paniker’s Textbook of Microbiology, 9th edition, pg no: 19-20)\nMotility of Enterobacteriaceae members', 'role': 'assistant'}]