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
Radiograph of a periodontal ligament of a tooth which has lost its antagonist shows: 
Select and explain. 
A. Widening of the PDL space, B. Narrowing of PDL space, C. Increased density, D. Sclerotic change
B: Narrowing of PDL space
Answer: B: Narrowing of PDL space 
Explanation: None