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': 'Most common hea lesion in down syndrome \nSelect and explain. \nA. ASD with ostium primum, B. ASD with ostium secundum, C. VSD, D. Coaection of aoa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., ASD with ostium primum About 40% children with down syndrome have congenital hea disease. Endocardial cushion defect (ASD with ostium primum) account for 40-60% of cases.", 'role': 'assistant'}]