This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Ureteric bud arises from: 
Select and explain. 
A. Mesonephric duct, B. Paramesonephric duct, C. Pronephric duct, D. None of the above
A: Mesonephric duct
Answer: A: Mesonephric duct 
Explanation: Ans. A. mesonephric ductAt the fifth week of development, the ureteric bud arises as a diverticulum from the mesonephric (Wolffian) duct. The bud grows laterally and invades the center of the metanephrogenic blastema, the primordial renal tissue. The meeting of these two tissues causes changes in the bud and the metanephros. The metanephrogenic blastema forms glomeruli, proximal tubules and distal tubules. The ureteric bud divides and branches forming the ureter, renal pelvis, calyces, and collecting tubules