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 X-ray right border of mediastinum is formed by all EXCEPT 
Select and explain. 
A. SVC, B. Right atrium, C. Right ventricle, D. Right brachiocephalic veins
C: Right ventricle
Answer: C: Right ventricle 
Explanation: Right mediastinal border is formed by right innominate (brachiocephalic) vein, SVC, right atrium, and IVC (IVC may not be visible in PA view).