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
Persistent foetal lobulation of adult kidney is due to: 
Select and explain. 
A. Congenital renal defect, B. Obstructive uropathy, C. Intrauterine infections and scar, D. Is a normal variant
D: Is a normal variant
Answer: D: Is a normal variant 
Explanation: None