Which of the following is a condition for further study in the DSM-5?

Caffeine Use Disorder is listed in the DSM-5, along with Attenuated Psychosis Syndrome, Depressive Episodes With Short-Duration Hypomania, Persistent Complex Bereavement Disorder, Internet Gambling Disorder, Neurobehavioral Disorder Associated With Prenatal Alcohol Exposure, Suicidal Behavior Disorder, and Non-suicidal Self-Injury, as conditions for further study. All of the other disorders listed as response choices are diagnosable conditions in the DSM-5.