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': 'Dentin bonding used for amalgam bonding is \nSelect and explain. \nA. HEMA, B. 1 META, C. 4 META, D. Not used', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]