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
[{'content': '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? \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]