Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
One example: fear of needles (medically known as belomophobia) is a term used to describe a large fear (phobia) of medical procedures involving needles.
Solution is here: fear of needles
Explanation: in this statement, we are talking about the fear of needles hence the output of the statement is fear of needles

Now, solve this: an agency is an organization which acts on behalf of others.
Solution:
agency