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: Dental
[{'content': 'Orthodontic extrusion of intruded permanent incisor can prevent \nSelect and explain. \nA. Replacement resorption, B. Calcification, C. Extraction, D. Non-vitality', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]