Which complication or association is classically linked with Down syndrome?

Answer and explanation

Correct answer: A. Atrioventricular septal defect

  1. Step 1: Atrioventricular septal defect is classically linked with Down syndrome.
Answer
Atrioventricular septal defect.
Why not the others: 'Hypertrophic cardiomyopathy': it is not characteristic of Down syndrome. 'Coarctation of the aorta': it is associated with Turner syndrome. 'Pulmonary valve stenosis': it is associated with Noonan syndrome.

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