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': 'Yield strength for orthodontic wires: \nSelect and explain. \nA. 0.20%, B. 0.10%, C. 0.30%, D. 0.40%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]