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
Polishing of composite is problematic due to 
Select and explain. 
A. Soft matrix and hard filler particles, B. Hard filler particles, C. Hardness of matrix and filler particles, D. None of the above
A: Soft matrix and hard filler particles
Answer: A: Soft matrix and hard filler particles 
Explanation: None