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: Orthopaedics
[{'content': 'Progression of congenital scoliosis is least likely in which of the following vertebral anomalies - \nSelect and explain. \nA. Fully segmented Hemivertebra, B. Wedge vertebra, C. Block vertebra, D. Unilateral unsegmented bar with Hemivertebra', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Congenital vertebral anomalies causing scoliosis are :\n\n\nHemivertebrae\nWedge vertebra\nUnsegmented bar\nBlock vertebra\nCombination : unsegmented bar with hemivertebrae\n\n\nAmongst these minimum chances of progression are with block vertebrae and maximum with the combination of unsegmented bar & hemivertebrae.\nUnsegmented bar - with hemivertebra > unsegmented bar > hemivertebra > wedge vertebra > block vertebra', 'role': 'assistant'}]