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
Nickel-titanium alloy has increased flexibility over stainless steel. How does the modulus of elasticity for nickel-titanium alloy compared to that of stainless steel? 
Select and explain. 
A. Similar to stainless steel, B. One-fourth to one-fifth that of stainless steel, C. Half that of stainless steel, D. 2 to 3 times that of stainless steel
B: One-fourth to one-fifth that of stainless steel
Answer: B: One-fourth to one-fifth that of stainless steel 
Explanation: None