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': 'Inorganic phase of the composites aid in: \nSelect and explain. \nA. Increasing the mechanical strength, B. Decreasing the coefficient of thermal expansion, C. Reducing the polymerization shrinkage, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]