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 dental surveyors were introduced to the field of dentistry in 1918 by: \nSelect and explain. \nA. Applegates, B. Kennedy, C. Kroll, D. AJ Fortunati', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]