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': 'Rubber Dam was introduced in dentistry? \nSelect and explain. \nA. S C Burnam in 1864, B. SC Burnam in 1856, C. Jogren in 1856, D. Bunocore in 1864', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]