The correct option is Liver.
Protein containing food after digestion is converted into the amino acids. Amino acids used to form protein for the body. But the body is unable to store excess protein. Excess amino acids in the LIVER undergo deamination process and get converted into ammonia, a nitrogenous waste. Ammonia is very toxic; it then further converted into urea, which is less toxic as compared to ammonia. The kidneys will then filter out the urea along with water from the blood circulation and excreted out in the form of urine.
