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': 'Head gear causes \nSelect and explain. \nA. Bucco lingual movement of maxillary molars, B. Mesio distal movement of maxillary molars, C. Intrusion of molars, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Headgears are the most commonly used oral orthopedic appliances.\nThey are indicated in\xa0patients with excessive horizontal growth of maxilla. They are used to distalize the maxillary dentition along with maxilla.', 'role': 'assistant'}]