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
Dunlop's beta hypothesis is useful for the treatment of: 
Select and explain. 
A. Bruxism., B. Thumb sucking., C. Mouth breathing., D. Tongue thrusting.
B: Thumb sucking.
Answer: B: Thumb sucking. 
Explanation: None