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
Free gingival groove represents 
Select and explain. 
A. Histologic depth of gingival sulcus, B. False pocket depth, C. Depth of gingival sulcus, D. None of the above
A: Histologic depth of gingival sulcus
Answer: A: Histologic depth of gingival sulcus 
Explanation: None