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
Thin spiral interdental brushes are used in which type of embrasures? 
Select and explain. 
A. Type 1, B. Type 2, C. Type 5, D. Type 4
B: Type 2
Answer: B: Type 2 
Explanation: None