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
[{'content': 'In atrial septal defect the aorta is – \nSelect and explain. \nA. Small, B. Normal, C. Enlarged, D. Aneurysmal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chest x-ray in ASD\n\nMild to moderate cardiomegaly \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nRight atrial and right ventricular enlargement. \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nPlethoric lung fields.\nprominent pulmonary artery segement.\nRelatively small aortic shadow', 'role': 'assistant'}]