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
Fishman's index is used in relation with 
Select and explain. 
A. Population, B. Hand wrist radiographs, C. Cephalograms, D. Periodontal diseases
B: Hand wrist radiographs
Answer: B: Hand wrist radiographs 
Explanation: None