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
Notching of ribs on X-ray is seen in: 
Select and explain. 
A. PDA, B. ASD, C. Ebstein Sanomaly, D. Coarctation of aoa
D: Coarctation of aoa
Answer: D: Coarctation of aoa 
Explanation: Ans. Coarctation of aoa