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
An overhanging proximo-occlusal amalgam restoration leads to: 
Select and explain. 
A. Decreased retention, B. Increased retention, C. Increased plaque accumulations, D. Fracture of the restoration
C: Increased plaque accumulations
Answer: C: Increased plaque accumulations 
Explanation: None