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 clit: 
Select and explain. 
A. Enlargement of left atrial appendage, B. Azygous vein enlargement, C. Coronary aery aneurysm, D. Pulmonary edema
A: Enlargement of left atrial appendage
Answer: A: Enlargement of left atrial appendage 
Explanation: A i.e. Enlargement of left atrial appendage Left hea border on chest X-ray PA view is fonned by- Aoic Knuckle, Pulmonary Conus, Left atrial Appendage and Left Ventricle. So left sided cardiac bulge is seen in enlargement of left atrial appendageQ. Mn- "AK PC LAAV = cb Personal computer LoVe" forms left hea border.