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': 'Left cardiac border bulge can be seen in all, except – \nSelect and explain. \nA. Enlarged azygous vein, B. Left appendicular overgrowth, C. Coronary artery aneurysm, D. Pericardial defect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Left cardiac border is slightly concave. Bulging (convexity) of left heart border is produced by : (1) Left atrial appendage enlargement; (2) Left ventricular enlargement; (3) Right ventricular enlargement; (4) Left anterior descending coronary artery aneurysm; (5) Left sided pericardial defect.', 'role': 'assistant'}]