A 5-Year-Old Youngster Is Brought to the Office by His

A 5-year-old youngster is brought to the office by his parents for cyanosis examination with no effort. The youngster has experienced instances of "turning blue" that began in infancy and are now becoming more regular. Throughout the episodes, the youngster squats because it makes him "feel better." The boy's family recently emigrated to the United States, and he had never received a medical examination previous to this visit. A significant right ventricular impulse and a loud systolic murmur are discovered during physical examination. Which of the following embryological events is the most likely cause of this patient's condition?

A) Anomalous pulmonary venous return
B) Aortic arch constriction
C) Deviation of the infundibular septum
D) Endocardial cushion defect
E) Linear development of the aorticopulmonary septum

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