The correct option is B Liver
Deamination and urea formation is a major function of liver. Deamination of amino acids is mainly done by liver (separation of amino group of amino acid and its conversion to ammonia). Preparation of urea from the amino acids is done by the liver. Liver converts ammonia (obtained from deamination) into urea through ornithine cycle. So, after the damage or spoilage of liver, the ammonia level in the animal body is increased and the animal dies.