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': 'Chronic periapical infection in primary molars is first\nnoted as \nSelect and explain. \nA. Rarefaction of bony furcation, B. As internal resorption, C. As rarefaction of Periapical tissues, D. Widening of Periodontal ligament space', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]