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
Rapid tooth separation works on following principle: 
Select and explain. 
A. Wedge principle., B. Traction principle., C. Both of the above., D. None.
C: Both of the above.
Answer: C: Both of the above. 
Explanation: None