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 major constituent in composite is \nSelect and explain. \nA. BIS-GMA and UDMA, B. Glycol and Glycidine, C. GIC and Silicate, D. Zinc oxide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]