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': 'Smoking \nSelect and explain. \nA. Increases signs of inflammation, B. Decreases signs of inflammation, C. Has no effect on signs of inflammation, D. Decreases periodontal destruction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]