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 means by which one part of R.P.D opposes the action of the retainer in the function is called 
Select and explain. 
A. Tripoding, B. Reciprocation, C. Retention, D. Stress breaking
B: Reciprocation
Answer: B: Reciprocation 
Explanation: None