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
Collecting pa of kidney develops from ? 
Select and explain. 
A. Pronephrons, B. Mesonephros, C. Metanephros, D. Ureteric bud
D: Ureteric bud
Answer: D: Ureteric bud 
Explanation: Ans. is 'd' i.e., Ureteric budDevelopment of kidney Kidneys develop from two sources :Metanephros (metanephric mesoderm or blastema) : It is the lowest pa of nephrogenic cord which is derived from intermediate mesoderm. It forms the excretory unit of kidney i.e. glomeruls, proximal convoluted tubule, loop of henle and distal convoluted tubule.Ureteric bud : It arises from lower pa of mesonephric duct. It forms collecting pa of kidney (pelvis, major calyes, minor calyces, collecting tubules) and ureter.