Mark the wrong statement about urea.

• A

  Some amount of urea may be retained in the kidney matrix to maintain osmolarity in some animals.

• B

  Mammals, many terrestrial amphibians and marine fishes mainly excrete urea.

• C

  Excretion of urea is considered a good terrestrial adaptation as it is least toxic nitrogenous waste.

• D

  Animals that excrete urea are referred to as ureotelic organisms and the process is ureotelism.