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 use of cervical vertebrae as skeletal maturity indicators was given by: 
Select and explain. 
A. Benninghoff, B. Hassel and Farman, C. Wolff, D. Brodie
B: Hassel and Farman
Answer: B: Hassel and Farman 
Explanation: The shapes of the cervical vertebrae differ at each level of skeletal development, and this helps to determine the skeletal maturity of a person. This is the basis of Hassel and Farman system of evaluating skeletal maturity using cervical vertebrae.