This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': 'Flowing wax appearance on anterior 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: Calcification of Anterior longitudinal ligament- DISH; Diffuse Idiopathic skeletal hyper osteosis Calcification of posterior longitudinal ligament -OPLL: Ossified posterior longitudinal ligament - JAPAN: Disease Ossification / calcification of interosseous membrane - FLUOROSIS', 'role': 'assistant'}]