This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Anatomical closure of Ductus Arteriosus takes place at 
Select and explain. 
A. At Birth, B. 10-12 hours after birth, C. 1 week after birth, D. 2-3 weeks after birth
D: 2-3 weeks after birth
Answer: D: 2-3 weeks after birth 
Explanation: Functional closure happens 10-12 hours after birth. Anatomical closure takes place at 2-3weeks after birth.