This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Spinal Injuries, Subject name: Orthopaedics
Beheaded Scottish terrier sign is seen in: 
Select and explain. 
A. Spondylosis, B. Spondylolisthesis, C. Osteo porosis, D. Osteogenesis imperfecta
B: Spondylolisthesis
Answer: B: Spondylolisthesis 
Explanation: Ans: b (Spondylolisthesis) Ref:Apley's OrthopaedicsScottish terrier sign is seen in spondylolysis and beheaded Scottish terrier sign in spondylolisthesis.