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
Coefficient of thermal expansion of tooth enamel is closest to: 
Select and explain. 
A. Silicate cement, B. Composite, C. GIC, D. Polycarboxylate
C: GIC
Answer: C: GIC 
Explanation: None