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: Surgery
[{'content': 'Ideal rhythm of Distraction osteogenesis is? \nSelect and explain. \nA. Continuous, B. 0.25 mm four times a day, C. 0.33 mm three times a day, D. 1.0 mm four times a day.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]