When trying to diagnose Tanika's problem, her psychologist observed that she was showing delusions and other serious thought disturbances. Her psychologist then used the DSM-5 to check whether Tanika had a history of a communication disorder and signs of depression as a way to:

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The psychologist used the DSM-5 to conduct a differential diagnosis, which involves ruling out various potential diagnoses to narrow down to the most likely one. This is a common method in diagnosing mental disorders. Checking for a history of a communication disorder and signs of depression are part of this process. A is not the best choice because simply checking for a communication disorder and depression using the DSM-5 is not enough to determine whether Tanika has a mental disorder. C is not the best choice because there is no indication that Tanika was at risk for suicide in this scenario. D is not the best choice because there is no indication that the psychologist used excessive backward reasoning.

When Trying to Diagnose Tanika's Problem, Her Psychologist Observed That