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
All of the following can be classified as myofunctional appliances, except: 
Select and explain. 
A. Anterior bite plane, B. Andersen appliance, C. Begg appliance, D. Oral screen
C: Begg appliance
Answer: C: Begg appliance 
Explanation: Begg's appliance is a fixed orthodontic appliance.