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
Coupling agent present in composite 
Select and explain. 
A. Organosilanes, B. Silica, C. BIS-GMA, D. TEGDMA
A: Organosilanes
Answer: A: Organosilanes 
Explanation: None