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
Heat hardening is done in which orthodontic wire 
Select and explain. 
A. Elgiloy, B. Stainless steel, C. TMA, D. NiTi
A: Elgiloy
Answer: A: Elgiloy 
Explanation: None