This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
All of the following structures lie in the renal medulla, Except 
Select and explain. 
A. Juxtaglomerular apparatus, B. Loop of Henle, C. Collecting duct, D. Vasa Recta
A: Juxtaglomerular apparatus
Answer: A: Juxtaglomerular apparatus 
Explanation: Ans. (a) Juxtaglomerular apparatus(Ref: Ganong, 25th ed/p.672)Structures that lie in renal medulla are,#Loop of Henle#Medullary collecting duct#Vasa recta