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
The relapse of crowding after orthodontic treatment occurs mainly because of: 
Select and explain. 
A. Horizontal fibers, B. Oblique fibers, C. Gingival fibers, D. Transseptal fibers
C: Gingival fibers
Answer: C: Gingival fibers 
Explanation: None