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
Beta titanium, an excellent choice for auxiliary springs is nothing but: 
Select and explain. 
A. Nitinol, B. TMA, C. Stainless steel, D. Sentinol
B: TMA
Answer: B: TMA 
Explanation: None