Ammonia which is produced by metabolism is converted into A in the liver of mammals and released into B which is filtered and C out by kidney
(a) A-Uric acid, B-Blood, C-excreted
(b) A-Urea, B-Blood, C-excreted
(c) A-Amino acid, B-Blood, C-excreted
(d) A-Sugar, B-Blood, C-excreted