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: Anatomy
Defect in any of the following may result in renal agenesis except - 
Select and explain. 
A. Nephrogenic bud, B. Ureteric bud, C. Blastema of nephrogenic tissue, D. Failure of descent of nephrogenic tissue to lumbar area
D: Failure of descent of nephrogenic tissue to lumbar area
Answer: D: Failure of descent of nephrogenic tissue to lumbar area 
Explanation: None