This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiology Q Bank, Subject name: Radiology
[{'content': 'Beheaded Scottish terrier sign is seen in \nSelect and explain. \nA. Spondylosis, B. Spondylolisthesis, C. Fracture transverse process of lumbar veebra, D. Fracture rib', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Optimal view for visualizing (spondylolysis) defect is=X-ray spine oblique view: - Scotty dog with "broken collar or neck" = Spondylolysis. - Beheaded Scotty dog = Spondylolisthesis. Oblique radiograph of lumbar spine is best view for radiographic diagnosis of spondylosis. Note the description of Scottish dog appearance as seen on oblique LS spine view and classical spondylolysis:', 'role': 'assistant'}]