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': 'Which of the following is an example of group III myofunctional appliances? \nSelect and explain. \nA. Activator, B. Bionator, C. Frankel, D. Twin block', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Myofunctional appliances can be categorised as follows:\nGroup I: Appliances that transmit muscle force directly to the teeth e.g., Vestibular screen.\nGroup II: These appliances reposition mandible and the resultant force is transmitted to the teeth and other oral structures e.g., Activator, Bionator.\nGroup III: They also reposition the mandible but their area of action is vestibule e.g., Frankel appliance.\nKey Concept\nGroup III: They also reposition the mandible but their area of action is vestibule e.g., Frankel appliance.\nReference: Textbook of orthodontics 2nd ed Gurkeerat Singh page no 502', 'role': 'assistant'}]