This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': 'Flowing wax appearance on anterior and posterior borders of veebrae is seen in - \nSelect and explain. \nA. Ankylosing spondylitis, B. DISH, C. Psoriatic ahropathy, D. Rheumatoid ahritis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiological features of DISH (Diffuse Idiopathic skeletal hyperostosis) : Flowing calcification and ossification along the anterolateral aspect of veebral bodies. - Flowing wax appearance Preserved disc space. Absence of bony ankyosis of facet joints,absence of sacroiliac bony erosion,sclerosis or bony fusion.', 'role': 'assistant'}]