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
Which of the following are example affixed active appliances 
Select and explain. 
A. Begg and straight wire, B. Begg and herbst, C. Activator and herbst, D. Activator and frankel
A: Begg and straight wire
Answer: A: Begg and straight wire 
Explanation: None