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
Gingival recession due to friction from soft tissues is known as: 
Select and explain. 
A. Gingival ablation, B. Frictional ablation., C. Both, D. None of the above.
A: Gingival ablation
Answer: A: Gingival ablation 
Explanation: None