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 the permanent dentition, earliest radiographic changes noted after chronic pulpal infection is: \nSelect and explain. \nA. Root resorption., B. PDL widening., C. Changes in bony furcation area., D. All of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In primary molar teeth, earliest radiographic change is in the form of a furcal radiolucency, bone loss or root resorption, depending on the chronicity of the infection.\nIn permanent teeth, earliest change is widening of PL.', 'role': 'assistant'}]