Which Condition Refers to an Inflammation of the Bladder

Question

Which condition refers to an inflammation of the bladder?
A) cystitis
B) pyelonephritis
C) urethritis
D) renal calculi

Accepted Answer

Cystitis specifically refers to inflammation of the bladder, while pyelonephritis refers to inflammation of the kidneys, urethritis refers to inflammation of the urethra, and renal calculi refer to kidney stones.