A 22-year-old pregnant woman presents to her OB-GYN for a prenatal checkup. The fetal heartbeat sounds irregular, and a fetal echocardiogram reveals an atrioventricular canal (AVC) defect. What is this condition a result of?
A) Failure of the ductus arteriosus to close
B) Incomplete fusion of the endocardial cushions
C) A patent foramen ovale
D) A right-to-left shunt
Correct Answer:
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