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
Orthodontic extrusion of intruded permanent incisor can prevent 
Select and explain. 
A. Replacement resorption, B. Calcification, C. Extraction, D. Non-vitality
A: Replacement resorption
Answer: A: Replacement resorption 
Explanation: None