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
Smoking 
Select and explain. 
A. Increases signs of inflammation, B. Decreases signs of inflammation, C. Has no effect on signs of inflammation, D. Decreases periodontal destruction
B: Decreases signs of inflammation
Answer: B: Decreases signs of inflammation 
Explanation: None