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
Which of the following causes rib-notching on the chest radiography? 
Select and explain. 
A. Bidirectional Clem shunt, B. Modified Blalock-Taussing shunt, C. IVC occlusion, D. Coarctation of aoa
D: Coarctation of aoa
Answer: D: Coarctation of aoa 
Explanation: Ans. Coarctation of aoa