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
1,1,1,1 Tetra-floroethylene is applied during cold test testing with? 
Select and explain. 
A. # 4 Cotton pellet, B. # 2 Cotton pellet, C. # 6 Cotton pellet, D. # 8 Cotton pellet
B: # 2 Cotton pellet
Answer: B: # 2 Cotton pellet 
Explanation: None