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': 'Biofilms in general have \nSelect and explain. \nA. Crystalline structure, B. Stereoline structure, C. Organized structure, D. Disorganized structure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]