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
Prominent left border of hea is formed by all the following except: 
Select and explain. 
A. Azygous vein, B. Pericardial cyst, C. Coronary aery aneurysm, D. Enlarged left auricular aneurysm
A: Azygous vein
Answer: A: Azygous vein 
Explanation: Ans. Azygous vein