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: Microbiology
[{'content': '"Tumbling" motility is shown by: \nSelect and explain. \nA. Proteus, B. Coli, C. Vibrio, D. Listeria', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Listeria', 'role': 'assistant'}]