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 is true regarding clasp arm? 
Select and explain. 
A. Longer the clasp, less is its flexibility, B. Bar clasp arm is less flexible than circumferential clasp, C. Half round clasp is more flexible than round clasp, D. All of the above
B: Bar clasp arm is less flexible than circumferential clasp
Answer: B: Bar clasp arm is less flexible than circumferential clasp 
Explanation: Although a bar clasp arm will usually be longer than a circumferential clasp arm, its flexibility will be less because its half round form lies in several planes, which prevents its flexibility from being proportionate to its total length.