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
Reciprocal arm serves mainly to: 
Select and explain. 
A. To give flexibility, B. Give indirect retention, C. Counteract the forces of retentive arm, D. To give support
C: Counteract the forces of retentive arm
Answer: C: Counteract the forces of retentive arm 
Explanation: None