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
Roach clasp arm refers to 
Select and explain. 
A. Retentive terminal of circumferential clasp, B. Reciprocal arm of circumferential clasp, C. Bar type clasp, D. None of the above
C: Bar type clasp
Answer: C: Bar type clasp 
Explanation: The term 'bar clasp' is generally preferred over the less descriptive term 'Roach clasp arm'. Reduced to its simplest term, the bar clasp arm arises from the denture framework or a metal base and approaches the retentive undercut from a gingival direction.