Answer:
Option D, treatment of depression
Explanation:
As the class of medication it belongs to may suggest, the antidepressant medication known as trazodone (brand name Desyrel) is used and prescribed in the treatment of depression, working by altering the effects of the hormone serotonin within the central nervous system, specifically increasing the amount of serotonin released in the brain.
It is also prescribed as an off-label medication in the treatment of anxiety disorders as a substitute for benzodiazepine medications, as well as insomnia in patients that experience sleep disturbances often related to post-traumatic stress disorder (PTSD).
However, trazodone's primary purpose in clinical practice is in the treatment of depression, option D.