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
Polymerization shrinkage by volume was overcome by adding: 
Select and explain. 
A. Fillers, B. Coupling agents, C. TEGDMA, D. All of the above
A: Fillers
Answer: A: Fillers 
Explanation: Advantages of adding fillers:

Reduces the coefficient of thermal expansion
Reduces polymerization shrinkage
Increases abrasion resistance
Decreases water sorption
Increases tensile and compressive strengths
Increases fracture toughness
Increases flexure modulus
Provides radiopacity
Improves handling properties
Increases translucency

Ref: Textbook of Operative Dentistry, Nisha and Amit Garg, 3rd edition, Pg no:253