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: Surgery
A patient of 40 years male got a blow on the angle region of mandible and he is asymptomatic. The x-rays of that region shows a radiopaque line with very sharp undercut in the lower border of mandible which may be due to: 
Select and explain. 
A. Sutural diastasis, B. Overlapping sign, C. Separation sign, D. Non union sign
B: Overlapping sign
Answer: B: Overlapping sign 
Explanation: None