instruction:
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:
clamp : clamp. iron : ?
answer:
iron


question:
stir : spoon. clamp : ?
answer:
clamp


question:
unlock : key. wash : ?
answer:

soap