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
Fejereskov and Thylstrup index is used for 
Select and explain. 
A. Caries Index in primary teeth, B. Index to measure Fluorosis, C. Gingival Bleeding Index, D. Periodontal Index
B: Index to measure Fluorosis
Answer: B: Index to measure Fluorosis 
Explanation: None