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 in an X-Ray is seen in which condition 
Select and explain. 
A. Horizontal Root Fracture, B. Acute apical abscess, C. Acute apical periodontitis, D. periapical periosteitis
D: periapical periosteitis
Answer: D: periapical periosteitis 
Explanation: Halo effect is typical of vertical root fracture. As that is not in the option next best choice is periapical periosteitis