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
When the pins are used in the cavity for amalgam, the strength of amalgam? 
Select and explain. 
A. Increased, B. Decreased, C. Unchanged, D. May increase or decrease
B: Decreased
Answer: B: Decreased 
Explanation: None