Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

wash : soap. toast : ?
toaster
To wash, one could use soap. Similarily, one could toast using a toaster..