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
Most common hea lesion in down syndrome 
Select and explain. 
A. ASD with ostium primum, B. ASD with ostium secundum, C. VSD, D. Coaection of aoa
A: ASD with ostium primum
Answer: A: ASD with ostium primum 
Explanation: 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.