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
Left sided cardiac bulge seen on chest X-ray is/are d/t to – 
Select and explain. 
A. Enlargement of left atrial appendage, B. Azygous vein enlargement, C. Coronary artery aneurysm, D. Pulmonary edema
A: Enlargement of left atrial appendage
Answer: A: Enlargement of left atrial appendage 
Explanation: None