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
Root planning is done to remove cementum that has been altered in conact with: 
Select and explain. 
A. Exotoxins, B. Endotoxins, C. Granulation tissue, D. Junctional epithelial lining
B: Endotoxins
Answer: B: Endotoxins 
Explanation: None