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': 'Which of the following restorative materials are likely\nto be eliminated in near future: \nSelect and explain. \nA. Amalgams, B. Glass ionomer, C. Porcelain, D. Composites', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]