MrKalish,a Long-Term Government Employee,falsely Believed That His Supervisor Was a Communist

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) borderline personality disorder.
C) schizophrenia.
D) antisocial personality disorder.