This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Radiology, Subject name: Radiology
Which of the following is not a pa of left mediastinal border on a PA chest radiograph? 
Select and explain. 
A. Aoic arch, B. Pulmonary trunk, C. Left ventricle, D. SVC
D: SVC
Answer: D: SVC 
Explanation: - The Left Hea Border on CXR is formed by Aoic Knuckle, Pulmonary aery, Left Auricle, and Left Ventricle. - The Right Hea Border on CXR is formed by Superior Vena cava, Rt Atrium and Inferior Venacava.