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
[{'content': 'In early acute pulpal abscess of children, radiograph shows: (OR) the first radiographic evidence of acute apical abscess can be \nSelect and explain. \nA. No change, B. destruction of lamina dura, C. Widening of periodontal ligament, D. rarefaction of alveolar bone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]