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
[{'content': 'In early stages, how is acute alveolar abscess is diagnosed: \nSelect and explain. \nA. No change., B. A diffuse radiolucency., C. PDL widening., D. None of the above.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]