In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The American Psychiatric Association ( APA ) is a group of psychiatrists in the United States .
The American Psychiatric Association ( APA ) is the main professional organization of psychiatrists and trainee psychiatrists in the United States , and the largest psychiatric organization in the world .