Which congenital condition requires antibiotic prophylaxis for endocarditis according to the material?

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The main idea is that antibiotic prophylaxis to prevent endocarditis is recommended for conditions that create a high risk of infection of the heart lining when bacteremia occurs, especially in certain congenital heart diseases that involve abnormal blood flow.

Congenital cyanotic heart defects are a classic high-risk category because they involve complex heart anatomy with chronic low oxygenation and turbulent intracardiac flow. This environment makes the endocardium more susceptible to bacterial adherence and vegetation formation after bacteremia, so prophylaxis is advised for procedures that can introduce bacteria into the bloodstream.

The other options describe prosthetic or prior infection factors, which are important risk considerations but are not congenital conditions. The question specifically targets congenital conditions, so the congenital cyanotic heart defect is the best answer.