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': 'As the alveolar bone height moves apically, center of resistance moves: \nSelect and explain. \nA. Apically, B. Coronally, C. Mesially, D. Infinity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]