Select the option that best completes the analogy: Surgeon : Scalpel :: Carpenter : ?

The relation is skilled worker : the cutting tool of that trade. A surgeon works with a scalpel; a carpenter works with a chisel. The distractors are all tools of some trade, which is the trap: the stethoscope belongs to the doctor but is not a cutting tool, the trowel to the mason and the anvil to the blacksmith.