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: Orthopaedics
[{'content': 'The injured nerve regenerates at the rate of \nSelect and explain. \nA. 0.1 cm/day, B. 1cm/day, C. 0.1mm/day, D. 1mm/hour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]