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
Which surface of tooth has most of plaque? 
Select and explain. 
A. Gingival third of tooth surface, B. Incisal one third of tooth surface, C. Middle third of tooth surface, D. Uniform on all surfaces
A: Gingival third of tooth surface
Answer: A: Gingival third of tooth surface 
Explanation: None