This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Hemivertebra is a defect of: \nSelect and explain. \nA. Body, B. Transverse process, C. Spine, D. Posterior vertebral arches', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Bodya. Vertebral bodies mainly develop from ventral sclerotome (VS) and thus hemivertebra is a defect of VS.b. Hemivertebra can lead to defects in the vertebral column - scoliosis.c. Posterior vertebral arches (PVA) contribute mainly to the lamina & spines. PVA are contributed by the dorsal sclerotome.', 'role': 'assistant'}]