The correct option is A bony fish
Cod liver oil is a pale-yellow oil obtained from the liver of the Atlantic cod. It is a rich source of vitamin A and D. It is widely used to treat and prevent rickets (caused due to the deficiency of vitamin D).
The scientific name of Atlantic cod is Gadus morhua. It is a bony fish included in the class Osteichthyes.
Shellfish is a term used in fisheries to represent the aquatic invertebrates bearing an exoskeleton. These are widely used as food across the world. It includes various species of molluscs (mussels and oysters), arthropods (crabs, prawns), and echinoderms.