The correct option is D Cartilaginous fish
Marine cartilaginous fishes (sharks, skates, rays and chimaeras) are known to retain a high concentration of urea (between 350 and 450 mmol l1) in their extracellular and intracellular fluids for adaptation to the marine environment, as this serves to maintain them at near isotonicity with sea water and are hence referred to as ureosmotic animals. So high levels of arginase enzymes is present in their liver to catalyze the production of urea from ammonia through the ornithine urea cycle (OUC).
Arginine+H2O→Ornithine+Urea