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
Hidden X suture proves to be a novel suturing technique for: 
Select and explain. 
A. Alveolar ridge preservation, B. Apical repositioning flap, C. Coronal repositioning flap, D. Papillae repositioning flap
A: Alveolar ridge preservation
Answer: A: Alveolar ridge preservation 
Explanation: None