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
Which of the following prevent extrusion and lateral tooth movement 
Select and explain. 
A. Alveolar crest group, B. Horizontal group, C. Oblique group, D. Apical group
A: Alveolar crest group
Answer: A: Alveolar crest group 
Explanation: None