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
[{'content': 'Which is an effect of fillers in composite is: \nSelect and explain. \nA. Increased thermal expansion., B. Decreased thermal expansion., C. Increased thermal contaction., D. Increased polymerization shrinkage.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fillers in composite\nGenerally between 30% to 70% by volume or 50% to 85% by weight of a composite\nBenefits of Fillers\nReinforcement- compressive strength, tensile strength, modulus of elasticity (i.e., stiffness or rigidity), and toughness\n\nReduction of polymerization shrinkage/contraction\nReduction in thermal expansion and contraction\nControl of workability/viscosity\nDecreased water sorption\nImparting radiopacity', 'role': 'assistant'}]