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
[{'content': 'Right side of mediastinal shadow is NOT formed by:September 2012 \nSelect and explain. \nA. Superior vena cava, B. Right innominate, C. Right atrium, D. Right ventricle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Right ventricleRadiology of heaRight border of hea is formed by:- SVC/ Right brachiocephalic vessels,- IVC and- Right atriumLeft border of hea is formed by:- Left atrial appendage,- Left ventricle,- Aoic arch and- Pulmonary aery', 'role': 'assistant'}]