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
In coarctation of aoa the rib changes are seen from: 
Select and explain. 
A. 1-12th, B. 3-6th, C. 4-9th, D. 8-12th
C: 4-9th
Answer: C: 4-9th 
Explanation: Ans. 4-9th