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': 'Coefficient of thermal expansion of tooth enamel is closest to: \nSelect and explain. \nA. Silicate cement, B. Composite, C. GIC, D. Polycarboxylate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]