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': 'Acrylic resins were first introduced as a denture base material in \nSelect and explain. \nA. 1925, B. 1937, C. 1951, D. 1956', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]