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
Oral screens are used for all the following purposes EXCEPT: 
Select and explain. 
A. Tongue thrusting, B. Mouth breathing, C. Lip biting, D. Retraction of upper protruded teeth
A: Tongue thrusting
Answer: A: Tongue thrusting 
Explanation: None