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
Which of the following component acts as surface coating agent and transfer load from weaker matrix to stronger stress bearing components: 
Select and explain. 
A. Silane coupling agent, B. Filler, C. Matrix, D. Adhesives
A: Silane coupling agent
Answer: A: Silane coupling agent 
Explanation: Coupling agent : A bonding agent applied to the surfaces of reinforcing particles (filler) to ensure that they are chemically bonded to the resin matrix. Organo-silane compounds are the more common class of dental composite coupling agents. Although titanates and zirconates can be used as coupling agents, organosilanes—such as γ-methacryloxypropyl tri-methoxysilane—are used most commonly.​
Phillips 12 ed page no. 275,286