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
As the alveolar bone height moves apically, center of resistance moves: 
Select and explain. 
A. Apically, B. Coronally, C. Mesially, D. Infinity
A: Apically
Answer: A: Apically 
Explanation: None