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
In early stages, how is acute alveolar abscess is diagnosed: 
Select and explain. 
A. No change., B. A diffuse radiolucency., C. PDL widening., D. None of the above.
C: PDL widening.
Answer: C: PDL widening. 
Explanation: PDL widening can be the method for diagnosing the acute alveolar abscess in early stage, while chronic alveolar abscess presents as more distinct radiographic lesion.