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': 'Restoration commonly recommended for cervical abrasion is \nSelect and explain. \nA. Silicate, B. Polycarboxylate, C. Glass ionomer, D. Composites', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]