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
A thin radiolucent tine which follows the root outline on X-rays is 
Select and explain. 
A. Lamina dura, B. Periodontal ligament, C. Nutrient canal, D. Pulp
B: Periodontal ligament
Answer: B: Periodontal ligament 
Explanation: None