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
[{'content': 'Beheaded Scottish terrier sign is – \nSelect and explain. \nA. Spondylosis, B. Spondylolisthesis, C. Lumbar canal stenosis, D. Slipped disc', 'role': 'user'}, {'content': "Answer: B \nExplanation: Oblique view of spine displays the lamina and articular processes more clearly than the classical anteroposterior & lateral views. The shadow of the neural arch resembles that of Scottish terrier dog.\nSpondylolysis\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0→ Scotty dog wearing a collar sign.\nSpondylolisthesis \xa0 \xa0\xa0→ (i) Beheaded Scotty dog sign;\n\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 (ii) 'Inverted Napoleon's Hat' sign.", 'role': 'assistant'}]