This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'After bih Ductus Venosus anatomically closes by \nSelect and explain. \nA. 10 to 96 hours, B. < 1week, C. 2 to 3 weeks, D. > 4 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The ductus venosus constricts by 10 to 96 hours after bih and is anatomically closed by 2 to 3 weeks, resulting in the formation of the ligamentum venosum.Reference: William&;s Obstetrics; 24th edition; Chapter 7; Embryogenesis and Fetal Morphological Development', 'role': 'assistant'}]