Correct Answer: Surgeon : Forceps

Solution :

Given:
Blacksmith : Hammer :: ? : ? (This depicts the relation between the professional and the tools used by him in his profession.)

Let's check the options –
First option: Cloth : Tailor; Cloth is not a tool used by a tailor.
Second option: Surgeon : Forceps; Forceps is a tool that is used by surgeons during surgeries.
Third option: Carpenter : Wood; Wood is not a tool used by carpenters.
Fourth option: Pen : Writer; Pen is used by the writer but here, the arrangement of words is not in the correct order.

So, only the second option follows the same pattern as followed by the given pair. Hence, the second option is correct.