Author is related to book in the same way choreographer is related to.......

Choose the correct description for the given relation.

Sandstone : Limestone : Coal

Gill is related to lamellae in the same way lung is related to........

Choose the correct description for the given relation.

Gnu : Emu : Curlew

Water is to Oxygen as Salt is to.........?

Choose the correct alternative for the given relation.

Traffic : Road