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': 'Size of Nano filled composite is: \nSelect and explain. \nA. 0.001-0.01 micron, B. 0.005-0.02 micron, C. Both 1 and 2, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]