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': 'Abnormally thick maxillary labial frenum results in \nSelect and explain. \nA. Maxillary Midline diastema, B. Imbrication of incisors, C. Labial inclination of incisors, D. Anterior deep bite', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]