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Anatomy
A 9-month-old girl was admitted to the children's hospital with tachypnea (fast breathing) and shoness of breath. Physical examination fuher exhibits tachycardia (fast hea rate), a bounding peripheral pulse, and her angiographs reveal a patent ductus aeriosus. Which of the following embryonic aerial structures is most likely responsible for the origin of the patent ductus aeriosus?
Right fouh arch
Left fifth arch
Right fifth arch
Left sixth arch
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