Final answer:
The DSM criterion for schizophrenia does not include the presence of active-phase symptoms for 6 months. Instead, the criteria require at least 6 months of symptoms with at least 1 month of active-phase symptoms.
Step-by-step explanation:
The DSM criterion for schizophrenia includes a range of symptoms characteristic of this mental illness, such as delusions, hallucinations, disorganized speech, and grossly disorganized or catatonic behavior. To meet the criteria for a diagnosis of schizophrenia, these symptoms must cause significant social or occupational dysfunction and last for at least 6 months, including at least 1 month of active-phase symptoms, which are the aforementioned ones. Therefore, the DSM criterion that is not for schizophrenia is B. Presence of active-phase symptoms for 6 months. Instead, the correct duration for schizophrenia diagnosis is at least 6 months of symptoms with at least 1 month of active-phase symptoms.