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
Which of the following hematological disease is associated with periodontal disease? 
Select and explain. 
A. AIDS, B. Hypophosphatesia, C. Wegener's granulomatosis, D. Histocytosis
A: AIDS
Answer: A: AIDS 
Explanation: None