This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Which of the following structures does the fetal allantoic duct become in the adult? \nSelect and explain. \nA. Cloaca, B. Medial umbilical ligament, C. Urachus, D. Ureter', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Urachus The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord. The fibrous remnant lies in the space of Retzius, between the transversalis fascia anteriorly and the peritoneum posteriorly.', 'role': 'assistant'}]