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': 'Straight wire appliances is developed by \nSelect and explain. \nA. Angle, B. Andrew, C. Begg, D. Pancherz', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]