The organ responsible for filtering blood and producing urine is?

• A. Ureter
• B. Spleen
• C. Liver
• D. Kidney

Answer: (D)

The organ that filters blood and produces urine is the kidney. Its main job is to remove waste products and excess fluids from the bloodstream, helping keep the body’s fluid and electrolyte balance in check. Inside each kidney are tiny filtering units called nephrons; blood is filtered in the glomerulus, and the filtrate goes through processes of reabsorption and secretion to form urine. The urine then travels down the ureters to the bladder for storage before excretion.

The other options don’t fit this function: the ureter is just a tube that carries urine from the kidney to the bladder; the spleen filters blood for immune and hematologic purposes but doesn’t make urine; and the liver handles metabolism and detoxification, not urine formation.