This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Inferior Rib notching is seen in? 
Select and explain. 
A. Coarctation of aorta, B. Marfan's syndrome, C. Rickets, D. SLE
A: Coarctation of aorta
Answer: A: Coarctation of aorta 
Explanation: a. Coarctation of aorta(Ref: Nelson's 20/e p 2205)Notching of the inferior border of 3rd - 9th ribs from pressure erosion by enlarged collateral vessels, is usually seen beyond the age of 3 years, in a child with coarctation of aorta.