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
BIS-GMA in composites 
Select and explain. 
A. Replaced strontium filler particles, B. Replaced acid soluble glass particles, C. Replaced silane coupling agents, D. Replaced methacrylate based matrix
D: Replaced methacrylate based matrix
Answer: D: Replaced methacrylate based matrix 
Explanation: None