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': 'An example for tooth colored bracket is \nSelect and explain. \nA. Ceramic bracket, B. Ceram flex bracket, C. Polyacrylic bracket, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]