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 the permanent dentition, earliest radiographic changes noted after chronic pulpal infection is: 
Select and explain. 
A. Root resorption., B. PDL widening., C. Changes in bony furcation area., D. All of the above.
B: PDL widening.
Answer: B: PDL widening. 
Explanation: 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.
In permanent teeth, earliest change is widening of PL.