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': 'Periodontal infection is characterized by increased sulcular levels of: \nSelect and explain. \nA. Interleukin, B. TNF β, C. IL - 2, D. None of above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]