This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Renal agenesis is due to 
Select and explain. 
A. Defect in ascent of metanephron, B. Defective formation of nephritic tissue, C. Defect of the ureteric bud and mesonephros, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Development of Kidney: Secretory pa of kidney:derived from metanephrons/metanephric blastyma Collecting pa of kidney:derived from ureteric bud