Correct Answer - C
( c) Main sources of uric acid are purines. Purines like adenine and Guanine change into xanthine which change into uric acid
`"Adenine"rarroverset("Guanine")overset(dowN//Arroe)"xanthine"rarr"uric acid"` Nitrogenous waste substances such as Ammonia, urea, or uric aicd are produced during protein metabolism according to the species. Small amout of nitrogenous waste substance are also produced during the metabolism of uncleic acids. Ammonia is the most toxic followed by urea and uric acid the latter is the least toxic.
