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 vulgaris, B. Proteus mirabilis, C. Vibrio, D. Listeria', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Listeria", 'role': 'assistant'}]