During the initial examination of a 3.6kg(8lb) male infant delivered at term, urine is found to be leaking from the umbilicus. This infant most likely has an abnormality of which of the following fetal structures?
A. Umbilical arteries
B. Umbilical vein
C. Urachus
D. Urogenital sinus
E. Urorectal septum
Ans: C. Urachus
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