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 major constituent in composite is 
Select and explain. 
A. BIS-GMA and UDMA, B. Glycol and Glycidine, C. GIC and Silicate, D. Zinc oxide
A: BIS-GMA and UDMA
Answer: A: BIS-GMA and UDMA 
Explanation: None