Which word completes the following analogy librarian : books:

rescue: emergency

farmer: microscope

horse: blacksmith

farmer: agriculture

I think that there is an error in the answer options.

Rather than farmer:microscope, it should be scientist:microscope.

A librarian is a person who handles tangible objects of the job.

Likewise, a scientist is a person who handles the tangible object of a microscope.

Answer: B) Scientist: Microscope