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 clasp most often used on the mandibular bicuspids when the most favorable retentive undercut is on the distobuccal surface adjacent to edentulous area is 
Select and explain. 
A. Ring clasp, B. Reverse loop clasp, C. Simple circlet clasp, D. Reverse approach circlet clasp
D: Reverse approach circlet clasp
Answer: D: Reverse approach circlet clasp 
Explanation: None