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 angle's system of classification of malocclusion was modified by: 
Select and explain. 
A. Simon, B. Dewey's, C. Lischer, D. Ackerman Profit
B: Dewey's
Answer: B: Dewey's 
Explanation: None