Identifying Characteristic Symptoms of Schizophrenia

Which of the following symptoms is most characteristic of schizophrenia?

Schizophrenia is a complex mental disorder frequently characterized by distortions in thinking, perception, emotions, language, and sense of self. The diagnosis of schizophrenia requires evidence of significant impairments in social and occupational functioning. Within this disorder, symptoms can be categorized into positive symptoms (excesses or distortions of normal functions) and negative symptoms (deficits in normal emotional responses or behaviors).