Mr. Kalish, a long-term government employee, falsely believed that his supervisor was a communist agent who was putting poison in the employees' coffee. When Mr. Kalish was referred to a psychiatrist, he claimed to be the grandson of Abraham Lincoln. Mr. Kalish is most likely suffering from

a. dissociative identity disorder
b. agoraphobia
c. schizophrenia
d. panic disorder
e. an antisocial personality disorder

c. schizophrenia

Explanation:

Schizophrenia is a psychological disorder that generates changes in the brain making it difficult for the patient to be able to judge what is reality or not. This disturbance causes the production of unreal, symbolic, delusional and paranoid thoughts. An example of this can be seen in the question above, where Mr. Kalish begins to have crazy thoughts, where he faithfully believes that his boss is a communist agent who is poisoning all employees and that he himself is the grandson of Abraham Lincoln.

Schizophrenia is a chronic disease and should be treated for life.

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this is true my friend.