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
What is the disadvantage of using composites as restorative material? 
Select and explain. 
A. Increased thermal conductivity, B. Decreased wear resistance, C. Decreased thermal conductivity, D. none of the above
B: Decreased wear resistance
Answer: B: Decreased wear resistance 
Explanation: None