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
Role of plasticizer in synthetic resins in dentistry is 
Select and explain. 
A. Increase smoothness, B. To increase bulk, C. To prevent polymerisation shrinkage, D. To reduce softening and fusion temperature
D: To reduce softening and fusion temperature
Answer: D: To reduce softening and fusion temperature 
Explanation: None