A 3-year-old boy is admitted to the children's hospital with complaints of restless- ness, abdominal pain, and fever. An MRI examination reveals that he has a double ureter. Which of the following embryonic structures is most likely failed to develop normally?
(A) Mesonephric (Wolffian) duct
(B) Paramesonephric (Mu?llerian) duct
(C) Ureteric bud
(D) Metanephros
(E) Pronephros
Answer: (C) Ureteric bud
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