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': 'Methyl methacrylate used in dentistry is a \nSelect and explain. \nA. Thermoset resin,but used by thermoplastic, B. Thermoplastic resin, but used by thermoset means, C. Thermoplastic resin, but used by thermoplastic means, D. Thermoset resin,used by thermoset means only', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]