Words given on the left side of (::) are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation.

Nairobi : Kenya :: Oslo: ?

Norway

Nairobi : Kenya :: Oslo: ?

The logic followed here is :

Nairobi : Kenya

Nairobi is the capital of Kenya

Similarly

Oslo : ?

Oslo is the capital of Norway