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
Stress breakers are not used in partial denture construction because: 
Select and explain. 
A. They are expensive, B. Increase the vertical dimension, C. They are difficult to design and fabricate, D. Harmful effect on the abutment
C: They are difficult to design and fabricate
Answer: C: They are difficult to design and fabricate 
Explanation: None