Which is NOT a function of the urinary system?

A. monitoring and maintaining blood pH at about 7.4
B. regulating blood pressure by regulating salt balance in the blood
C. elimination of nitrogenous wastes including urea, uric acid, and creatinine
D. hormone secretion to stimulate red blood cell production and regulate sodium ion levels
E. production of water from oxygen and bicarbonate ions (HCO₃)