Question
A 3-day-old boy delivered at 32 weeks of gestation is experiencing respiratory distress syndrome. The physician detects a heart murmur characteristic of a patent ductus arteriosus, a diagnosis that is confirmed with an echocardiogram. Which embryonic structure is involved in this diagnosis?
| A. | Left third aortic arch |
| B. |
Right third aortic arch |
| C. |
Left sixth aortic arch |
| D. |
Umbilical arteries |
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