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: Pediatrics
Which of the following features on X-ray chest can differentiate an Atrial septal Defect (ADH) from a Ventricular Septal Defect (VSD) 
Select and explain. 
A. Enlarged Left Atrium, B. Pulmonary Plethora, C. Enlarged pulmonary Aery, D. Enlarged Aoa
A: Enlarged Left Atrium
Answer: A: Enlarged Left Atrium 
Explanation: Ans is 'a' i.e., Enlarged Left Atrium o Left atrium is not enlarged in an ASD in contrast to VSD where the left atrium is typically enlarged. Features ASD VSD PDA Chamber RA + RV LA +LV+ RV LV+LA +RV Enlargement (Mild/moderate cardiomegaly) (Gross caiomegaly) Pulmonary Aery Enlarged Enlarged Enalrged Pulmonary Present Present Present Vasculature (Pulmonary Plethora) Aoa Normal (or small) Normal (or small) Enlarged