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
Anderson and Hillman in 1971 introduced this into orthodontics? 
Select and explain. 
A. β NiTi, B. NiTinol, C. Chinese NiTi, D. Sentalloy
B: NiTinol
Answer: B: NiTinol 
Explanation: None