Urethrocystitis is inflammation of which two structures?

A. Glomerulus and bladder
B. Kidney and bladder
C. Urinary tract and bladder
D. Urethra and bladder

D. Urethra and bladder

To determine the answer to this question, we can break down the term "urethrocystitis" to understand which structures are involved.

The term "urethrocystitis" consists of two root words: "urethro-" and "-cystitis."

The root word "urethro-" refers to the urethra, which is the tube that transports urine from the bladder to outside the body.

The suffix "-cystitis" refers to inflammation of the bladder.

Therefore, combining the two root words, "urethrocystitis" refers to inflammation of both the urethra and the bladder.

Hence, the correct answer is D. Urethra and bladder.