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
Which is an effect of fillers in composite is: 
Select and explain. 
A. Increased thermal expansion., B. Decreased thermal expansion., C. Increased thermal contaction., D. Increased polymerization shrinkage.
B: Decreased thermal expansion.
Answer: B: Decreased thermal expansion. 
Explanation: Fillers in composite
Generally between 30% to 70% by volume or 50% to 85% by weight of a composite
Benefits of Fillers
Reinforcement- compressive strength, tensile strength, modulus of elasticity (i.e., stiffness or rigidity), and toughness

Reduction of polymerization shrinkage/contraction
Reduction in thermal expansion and contraction
Control of workability/viscosity
Decreased water sorption
Imparting radiopacity