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': 'Which of the following is not the contribution of E.H. Angle? \nSelect and explain. \nA. Pin & Tube Appliance, B. E-Arch Appliance, C. Edgewise Appliance, D. Straight Wire Appliance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]