how can i use resources.load<>(prefabs) by class type?

I saw some sample code,
in that code, use load method like this

agent _agent = resources.load<agent>(“Prefabs”);

That prefabs had script component monobehavior class agent.cs, and in that script can use that prefabs object like class object

I try this in my project, but cant load class typed prefabs.

How can I load prefabs as monobehavior class type object?