In a field-effect transistor, from which electrode do charge carriers leave the channel?

In a Field-Effect Transistor (FET), the drain is the terminal where the charge carriers exit or 'drain' away from the channel after flowing in from the source. Remembering the simple analogy of water flowing from a source and leaving through a drain makes this easy to recall. The gate is used to control this flow but does not emit or collect the main current itself. The collector is a component of a bipolar junction transistor, not a FET, so it cannot be the correct answer.