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 Brudevold’s solution was introduced in- \nSelect and explain. \nA. 1960, B. 1950, C. 1970, D. 1980', 'role': 'user'}, {'content': "Answer: A \nExplanation: Acidulated\xa0phosphate\xa0fluoride\xa0was\xa0introduced in the 1960's by Brudevold and his\xa0co-workers at the Forsyth Dental Center,\xa0Boston, Massachusetts.", 'role': 'assistant'}]