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': 'IDA was established in \nSelect and explain. \nA. 1945, B. 1949, C. 1920, D. 1960', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]