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': 'Orthodontic closure of a midline diastema in a patient with thick maxillary frenum: \nSelect and explain. \nA. Is accomplished prior to the frenum surgery, B. Is accomplished after the frenum surgery, C. After orthodontic closure, frenum surgery is typically not indicated, D. After frenum surgery, orthodontic closure is typically not indicated', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Orthodontic closure of a midline diastema is accomplished prior to the periodontal surgery. If a frenectomy is performed prior to orthodontic treatment, it is possible that scar tissue could form in the area, which may impede orthodontic tooth movement.', 'role': 'assistant'}]