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.

[Q]: dig : shovel. iron : ?
[A]: iron


[Q]: mop : mop. drill : ?
[A]: drill


[Q]: sweep : broom. iron : ?
[A]:
iron