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': 'The social engineering phase in public health is between the years: \nSelect and explain. \nA. 1880-1920, B. 1920-1960, C. 1960-1980, D. 1981-2000', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]