Which of the Following Is Not True of the Urinary

Which of the following is not true of the urinary bladder?

A) The detrusor muscle makes up the muscular coat of the urinary bladder.
B) The trigone contains openings for the ureters and the urethra.
C) The bladder can store about 600 mL of urine, but the urge to void can be felt when it contains about 500 mL.
D) Rugae are folds of the mucosa that allow the urinary bladder to stretch for urine storage.
E) All of these are true of the urinary bladder.