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 temporary feeling of dry mouth after tooth brushing with tooth paste is due to the presence of: 
Select and explain. 
A. Sodium lauryl sulfate, B. Glycol, C. Sweetener, D. Friction due to brushing
A: Sodium lauryl sulfate
Answer: A: Sodium lauryl sulfate 
Explanation: None