This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'All the following are non-motile Enterobacteriaceae members except \nSelect and explain. \nA. Morganella, B. Shigella, C. Klebsiella, D. Yersinia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: S/K/Y (mentioned options) are non-motile Enterobacteriaceae members Ref: Textbook of Microbiology Baveja 5th ed Pg 244', 'role': 'assistant'}]