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
[{'content': 'Beheaded Scottish terrier sign is seen in: \nSelect and explain. \nA. Spondylosis, B. Spondylolisthesis, C. Osteo porosis, D. Osteogenesis imperfecta', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: b (Spondylolisthesis) Ref:Apley's OrthopaedicsScottish terrier sign is seen in spondylolysis and beheaded Scottish terrier sign in spondylolisthesis.", 'role': 'assistant'}]