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
Which of the following best represents the bone loss in the following radiograph? 
Select and explain. 
A. X - 1.5 mm, B. X - 0.5 mm, C. X  + 0.5 mm, D. X
A: X - 1.5 mm
Answer: A: X - 1.5 mm 
Explanation: None