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A 70 year old man dies of lung cancer. At autopsy an outpouching from the apex of the urinary bladder is seen. The pouch is continuous with a fibrous cord running in the direction of the umbilicus. This pouch represents a remnant of which of the following structures?

A- Omphalomesenteric duct
B- Umbilical vein
C- Umbilical artery
D- Urachus
E- Yolk sac
 
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