The answer is D ; Electrolytes.
Urine is an aqueous solution with greater than 95% water. Other constituents include urea, chloride, sodium, potassium, creatinine and other dissolved ions, and inorganic and organic compounds. Urea is s non toxic molecule made of toxic ammonia and carbon dioxide. There is about 60 times as much urea as uric acid in urine. Creatinine is a hydrated form of creatine which is twice as much as uric acid in the urine.