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: Radiology
A patient with a history of radiation therapy required special consideration because: 
Select and explain. 
A. The vascularity of the bone may be disrupted, B. Salivary function may be increased, C. Plaque accumulation greater than normal can be expected, D. The potential for periodontal disease is greatly increased
A: The vascularity of the bone may be disrupted
Answer: A: The vascularity of the bone may be disrupted 
Explanation: None