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
Inorganic phase of the composites aid in: 
Select and explain. 
A. Increasing the mechanical strength, B. Decreasing the coefficient of thermal expansion, C. Reducing the polymerization shrinkage, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None