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
In orthodontics activity index means: 
Select and explain. 
A. RANK/ and OPG in GCF, B. IL-1 beta/IL R-A in GCF, C. IL-1/IL6 in saliva, D. IL-6/11.8 in saliva
B: IL-1 beta/IL R-A in GCF
Answer: B: IL-1 beta/IL R-A in GCF 
Explanation: None