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
Bonding of composite resins to tooth structure is by: 
Select and explain. 
A. Covalent bond, B. Ionic bond, C. Mechanical, D. Vanderval forces
C: Mechanical
Answer: C: Mechanical 
Explanation: None