According to the positive/negative symptom classification scheme for schizophrenia,

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Positive symptoms in schizophrenia are characterized by the presence of abnormal behaviors or experiences, such as hallucinations, delusions, and disorganized speech. These symptoms are thought to be caused by an excess of dopamine in certain areas of the brain. Therefore, drugs that increase dopamine can worsen positive symptoms. Option A is incorrect because some people with positive symptoms do respond well to medications. Option C is incorrect because negative symptoms tend to develop early in the course of the illness, not in adulthood. Option D is incorrect because delusions and hallucinations are examples of positive symptoms, not negative symptoms.

According to the Positive/negative Symptom Classification Scheme for Schizophrenia