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
Which of the following is not the contribution of E.H. Angle? 
Select and explain. 
A. Pin & Tube Appliance, B. E-Arch Appliance, C. Edgewise Appliance, D. Straight Wire Appliance
D: Straight Wire Appliance
Answer: D: Straight Wire Appliance 
Explanation: None