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': 'Speed of rabies virus progress in axon is \nSelect and explain. \nA. 100 mm/day, B. 150 mm/day, C. 200 mm/day, D. 250 mm/day', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Speed of rabies virus progress in axon is 250\xa0mm/day.', 'role': 'assistant'}]