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
A new born presents with mid anterior abdominal wall defect with characteristic spontaneous disappearance at age of 4 years - 
Select and explain. 
A. Patent urachus, B. Omphalocele, C. Ectopia vesicae, D. Umibilical hernia
D: Umibilical hernia
Answer: D: Umibilical hernia 
Explanation: None