Explanation:

- Kidneys: These organs filter blood and form urine, but do not store it.

- Urinary bladder: This is the correct answer, as it is where urine is stored temporarily before excretion.

- Liver: This organ processes nutrients and detoxifies, but it has no role in urine storage.

- Nephron: These are microscopic functional units in kidneys where urine formation begins, but they do not store urine.