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 main function of the horizontal fibres of P.D ligament is 
Select and explain. 
A. Prevent extrusion, B. Prevent rotation, C. Maintains the mesiodistal width, D. All of the above
C: Maintains the mesiodistal width
Answer: C: Maintains the mesiodistal width 
Explanation: None