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.
--------
Question: wash : detergent. spread : ?

Answer: knife


Question: crack : nutcracker. iron : ?

Answer: iron


Question: cut : knife. vacuum : ?

Answer:
vacuum