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
[{'content': 'Defect in any of the following may result in renal agenesis except : \nSelect and explain. \nA. Nephrogenic bud, B. Uretericbud, C. Blastema of nephrogenic tissue, D. Blastema of nephrogenic tissue', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Failure of descent of nephrigenic tissue to lumber', 'role': 'assistant'}]