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
Posterior Scalloping of vertebra is seen in all except 
Select and explain. 
A. Neurofibromatosis, B. Marfan's, C. Achondroplasia, D. Homocystinuria
D: Homocystinuria
Answer: D: Homocystinuria 
Explanation: Fish mouth vertebra is seen in Homocystinuria.