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': 'Block veebrae are seen in - \nSelect and explain. \nA. Pagets disease, B. Leukemia, C. TB, D. Klippel - Feil syndrom', 'role': 'user'}, {'content': "Answer: D \nExplanation: Features of Klippel Feil syndrome: Fused/block veebra. hemiveebra spina bifida occulta scoliosis atlas occipitalization associated with sprengel's deformity Also know Klippel Trenaunay syndrome : * Klippel-Trenaunay syndrome presents with a classic triad of hemi-hyperophy, po wine stain, and congenital venous or venolymphatic malformations. * This entity should be distinguished from Parkes-Weber syndrome, which is similar, but features formation of aeriovenous malformations (leading to high output cardiac failure) and no lymphatic malformations.", 'role': 'assistant'}]