This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Anterior scalloping of veabrae seen in - \nSelect and explain. \nA. Obsteogenesis imperfecta, B. Aoic aneurysm, C. Metastasis, D. Renal Cell Ca', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans is option 2... Aoic aneurysm Anterior scalloping is seen in following conditions Aoic aneurysm, tuberculous spondylosis, lymphadenopathy, delayed motor development (in downs syndrome) Posterior scalloping is seen in Tumors in spinal canal (ependymoma, lipoma,, neurofibroma), neurofibromatosis, acromegally, achondroplasia, congenital syndromes like Ehler-Danlos, Marfans, Hurlers etc Ref Chapman 3/e p 88,89', 'role': 'assistant'}]