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': 'The particle size in microfilled composites is \nSelect and explain. \nA. 0.02 to 0.04 mm, B. 0.5 to 1.0 microns, C. 0.01 to 0.1 microns, D. 0.3 to 0.4 mm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]