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 greatest potential for wearing exists when : 
Select and explain. 
A. Porcelain opposes porcelain., B. Porcelain opposes acrylic., C. Porcelain opposes gold., D. Porcelain opposes natural teeth.
B: Porcelain opposes acrylic.
Answer: B: Porcelain opposes acrylic. 
Explanation: None