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
The cause of bone destruction in juvenile periodontitis is: 
Select and explain. 
A. Phagocytosis are reduced, B. Reduced neutrophilic chemotaxis, C. Decreased host resistance, D. Highly virulent microorganisms
B: Reduced neutrophilic chemotaxis
Answer: B: Reduced neutrophilic chemotaxis 
Explanation: None