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 advantage of unfilled methyl methacrylate is that: 
Select and explain. 
A. It can be finished smoothly, B. It has a low degree of flow, C. It's non-irritation to pulp, D. It's wear resistant is high
A: It can be finished smoothly
Answer: A: It can be finished smoothly 
Explanation: None