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
Frankel appliance is a: 
Select and explain. 
A. Myofunctional appliance, B. Removable appliance, C. Fixed appliance, D. None of the above
A: Myofunctional appliance
Answer: A: Myofunctional appliance 
Explanation: Frankel appliance is a removable myofunctional appliance.