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
Collecting tubules of kidney develop from 
Select and explain. 
A. Ureteric bud, B. Mesonephric duct, C. Paramesonephric duct, D. Wolffian duct
A: Ureteric bud
Answer: A: Ureteric bud 
Explanation: Collecting ducts of the permanent kidney develop from the ureteric bud, an outgrowth of the mesonephric duct close to its entrance to the cloaca. The bud penetrates the metanephric tissue, which is molded over its distal end as a cap. Subsequently, the bud dilates, forming the primitive renal pelvis, and splits into cranial and caudal poions, the future major calyces.Ref: Guyton; 13th edition; Chapter 65; Secretory Functions of the Alimentary Tract