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 most preferred type of Dental floss is: 
Select and explain. 
A. Unwaxed thin floss, B. Unwaxed thick floss, C. Waxed thin floss, D. Waxed thick floss
A: Unwaxed thin floss
Answer: A: Unwaxed thin floss 
Explanation: None