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: Radiology
[{'content': 'A classical expansive lytic lesion in the transverse process of a vertebra is seen in - \nSelect and explain. \nA. Osteosarcoma, B. Aneurysmal bone cyst, C. Osteoblastoma, D. Metastasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Both ABC and osteoblastoma can arise in the posterior elements of vertebrae (i.e. Pedicle, lamina, transverse process or spinous process).\nABC produces lytic (lucent) lesion, while osteoblastoma produces lytic lesion surrounded by a rim of sclerosis.', 'role': 'assistant'}]