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': 'All of the following can be classified as myofunctional appliances, except: \nSelect and explain. \nA. Anterior bite plane, B. Andersen appliance, C. Begg appliance, D. Oral screen', 'role': 'user'}, {'content': "Answer: C \nExplanation: Begg's appliance is a fixed orthodontic appliance.", 'role': 'assistant'}]