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
Universal matrix band retainer is also known as 
Select and explain. 
A. Ivory 8 retainer, B. ToffLemke retainer, C. Sequiland retainer, D. None of the above
B: ToffLemke retainer
Answer: B: ToffLemke retainer 
Explanation: None