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 matrix retainer wherein anatomy adaptation is possible without wedges is 
Select and explain. 
A. Tofflemire, B. Steele’s siqveland, C. Ivory no. 1, D. Ivory no. 8
B: Steele’s siqveland
Answer: B: Steele’s siqveland 
Explanation: Steele’s Siqveland is a self- adjusting matrix retainer without the use of wedges. It is used on a tapering tooth.