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
Severe alveolar bone loss, as observed in juvenile periodontitis is associated with: 
Select and explain. 
A. Cyclic neutropenia, B. Lysis of neutrophils, C. Increased phagocytosis, D. Neutrophil chemotactic defects or Impaired neutrophil chemotaxis
D: Neutrophil chemotactic defects or Impaired neutrophil chemotaxis
Answer: D: Neutrophil chemotactic defects or Impaired neutrophil chemotaxis 
Explanation: None