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 not an indication for bar clasp arm 
Select and explain. 
A. When a small degree of undercut exists in cervical third of abutment tooth, B. On abutment teeth for tooth supported partial denture, C. Soft tissue undercuts, D. Distal extension bases
C: Soft tissue undercuts
Answer: C: Soft tissue undercuts 
Explanation: The specific indications for using a bar clasp arm are

When a small degree of undercut (0.01 inch) exists in the cervical third of the abutment tooth, which may be approached from a gingival direction.
On abutment teeth for tooth supported partial dentures or tooth supported modification areas .
In distal extension base situations.
In situations, where esthetics is a concern.