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: Medicine
[{'content': 'Anterior scalloping of vertabrae seen in -a) Obsteogenesis imperfectab) Aortic aneurysmc) Metastasisd) Renal Cell Cae) T.B. \nSelect and explain. \nA. ab, B. ad, C. bc, D. be', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]