Two analogies that relate objects to the associated rooms is given in the form "A : B. C : ?". "A : B" relates object A to room B. Your task is to replace the question mark (?) with the appropriate room for the given object C, following the "A : B" relation.

refrigerator : kitchen. nightstand : ?
bedroom

desk : office. table : ?
kitchen

bookshelf : hallway. sink : ?

bathroom