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
[{'content': 'The function of the coupling agent in a restorative resin\nis to allow: \nSelect and explain. \nA. Adhesion of resin particles, B. Bonding between filler crystals, C. Bonding between filler and resin, D. Bonding between tooth and resin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]