Final answer:
The symptom that does not belong to schizophrenia is (D) Manic behavior, which is more commonly associated with bipolar disorder. Schizophrenia symptoms include delusions, hallucinations, disorganized speech, and decreased emotional expression. The correct option is D).
Step-by-step explanation:
All of the symptoms listed in the question, except for manic behavior, are commonly associated with schizophrenia. Schizophrenia is characterized by a variety of symptoms such as delusions, hallucinations, disorganized speech, and decreased emotional expression.
These symptoms reflect the individual's difficulty in differentiating between reality and imagination, and disruptions in emotional responses and thinking processes.
Manic behavior, on the other hand, is more typically associated with bipolar disorder, not schizophrenia. In the context of neuroleptic drugs, which are used to treat schizophrenia, patients may experience sedation initially, but psychotic symptoms tend to decrease over time with continued use of the medication. Option D) is the correct one.