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
Anterior scalloping of vertabrae seen in -a) Obsteogenesis imperfectab) Aortic aneurysmc) Metastasisd) Renal Cell Cae) T.B. 
Select and explain. 
A. ab, B. ad, C. bc, D. be
D: be
Answer: D: be 
Explanation: None