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
Halo effect surrounding the root of tooth on IOPA X-Ray is seen with? 
Select and explain. 
A. Horizontal root fracture, B. Root caries, C. Widening of periodontal ligament space, D. Periapical-periostitis
D: Periapical-periostitis
Answer: D: Periapical-periostitis 
Explanation: None