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
Transitional epithelium or urothelium lines all of the following structures of the urinary system, EXCEPT: 
Select and explain. 
A. Ureters, B. Minor calyx, C. Urinary bladder, D. Membranous Urethra
D: Membranous Urethra
Answer: D: Membranous Urethra 
Explanation: The normal urothelium is composed of 3-7 layers of transitional cell epithelium. It is characterized by a superficial layer of dome like cells that are neither squamous nor columnar. These cells, sometimes called umbrella cells. It lines,Walls of the calicesPelvisUrinary bladderUretersUpper pa of the urethra