A 60 year old man is brought to a psychiatrist with a 10 year history, that he suspects his neighbours and he feels that whenever he passes by they sneeze and plan agaist behind his back. He feels that his wife has been replaced by a double and calls police for help. He is quite well groomed ale, occasionaly consumes alcohol, likely diagnosis is:
Paranoid personality Paranoid schizophrenia Alcohol withdrawal Conversion disorder