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
A composite index combining indicators representing longevity, knowledge and income is 
Select and explain. 
A. Physical quality of life index, B. Human development index, C. Sullivan's index, D. Human poverty index
B: Human development index
Answer: B: Human development index 
Explanation: None