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
Retention grooves  in cast inlay provide: 
Select and explain. 
A. Secondary resistance form., B. Secondary retention form, C. Primary retention form, D. None
A: Secondary resistance form.
Answer: A: Secondary resistance form. 
Explanation: DIFFERENES  BETWEEN INLAY AND AMALGAM RESTORATIONS: