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
The tissue response to oral hygiene instruction is best
assessed by 
Select and explain. 
A. Probing the base of the socket, B. Changes in plaque scores, C. Reduced tendency to bleed on probing the gingival margin, D. Reduced tooth mobility
C: Reduced tendency to bleed on probing the gingival margin
Answer: C: Reduced tendency to bleed on probing the gingival margin 
Explanation: None