The case of Kevin Warner was presented in the text as an example of the diagnosis of schizophrenia. Which of Kevin's symptoms strongly suggested that he had lost touch with reality, which is the defining feature of schizophrenia?

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Kevin's belief that people were poisoning him is a common symptom of paranoid schizophrenia, which is characterized by delusions and hallucinations that cause the person to lose touch with reality. Social withdrawal and difficulty in communicating can also be symptoms of schizophrenia, but they are not as closely associated with losing touch with reality as delusions and hallucinations. Inability to succeed at work may be a consequence of schizophrenia, but it is not a symptom that indicates loss of touch with reality.

The Case of Kevin Warner Was Presented in the Text