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': 'Lateral repositioning flap is done for \nSelect and explain. \nA. gingival recession, B. high frenal attachment, C. increasing the width of attached gingiva, D. shallow vestibule', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]