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
Ni-Ti instruments are flexible because of their 
Select and explain. 
A. Plasticity, B. Rigidity, C. Superelastcity, D. Hardness
C: Superelastcity
Answer: C: Superelastcity 
Explanation: None