Category Analogy — Item to its class: Australia : Continent :: ____

Introduction / Context:
Australia is an item in the class “continent”. We need another “item : its class” pair.

Concept / Approach:
INS Vikrant is a ship; thus “Vikrant : ship” mirrors “item : class”.

Why Other Options Are Wrong:
“Engine : Train” is part–whole; “River : Coast” is relational/adjacency; “Yuri Gagarin : Space” is “person : domain”.

Final Answer:
Vikrant : ship