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': 'Model diagnostic setup for planning clear aligners was given in 1945 by? \nSelect and explain. \nA. Kesling, B. Johnson, C. Angle, D. Ribbs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]