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 can be used as root canal filling materials \nSelect and explain. \nA. Cements and plastic materials, B. G.P. Points, C. Silver points, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]