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 Alma-Ata declaration on 'primary health care' was made in the year: \nSelect and explain. \nA. 1980, B. 1978, C. 1982, D. 1977", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]