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': 'The term gingival ablation indicates \nSelect and explain. \nA. Gingival recession due to faulty tooth brushing, B. Gingival recession accentuated by prominent palatal root, C. Gingival recession due to friction from hard food, D. Gingival recession due to friction from soft tissue', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]