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': 'Which of the following prevent extrusion and lateral tooth movement \nSelect and explain. \nA. Alveolar crest group, B. Horizontal group, C. Oblique group, D. Apical group', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]