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
Which of the following clasp is preferable on a partially erupted tooth for adequate retention of removable orthodontic appliance? 
Select and explain. 
A. Circumferential clasp, B. Adams clasp, C. Jacksons clasp, D. South end clasp
B: Adams clasp
Answer: B: Adams clasp 
Explanation: None