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
Habits are classified as Intentional and Unintentional by: 
Select and explain. 
A. William James, B. Kingsley, C. Earnest Klein, D. Finn and Sim
C: Earnest Klein
Answer: C: Earnest Klein 
Explanation: None