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 function of the coupling agent in a restorative resin is to allow: 
Select and explain. 
A. Adhesion of resin particles, B. Bonding between filler crystals, C. Bonding between filler and resin, D. Bonding between tooth and resin
C: Bonding between filler and resin
Answer: C: Bonding between filler and resin 
Explanation: None