This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), Subject name: Microbiology
[{'content': 'Non motile organism - \nSelect and explain. \nA. E. coli, B. Vibrio cholera, C. Proteus vulgaris, D. Shigella dysentery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Entire Enterobacteriaceae family is motile (peritrichous flagella )except:- Shigella and Klebsiella., atypical e.coli, salmonella gallinarium, salmonella pullorum, yersenia pestis', 'role': 'assistant'}]