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: Surgery
Patent vitello-intestinal duct should preferably be operated at - 
Select and explain. 
A. Birth, B. 6 months of age, C. 12 months of age, D. 3 years of age
B: 6 months of age
Answer: B: 6 months of age 
Explanation: None