This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular Radiology, Subject name: Radiology
Which of the following is not a Chest radiographic feature of Left atrial enlargement? 
Select and explain. 
A. Double Left hea border, B. Elevated Left main bronchus, C. Splaying of carina, D. Enlargement of Left atrial appendage
A: Double Left hea border
Answer: A: Double Left hea border 
Explanation: * Left atrial enlargement / Mitral stenosis: Features: * Straighten of left hea borders * Widening of carina with elevated left main bronchus * Has double right hea borders * Enlargement of left atrial appendage * Indentation of oesophagus