<prompt> A patient presents with one month history of abnormal hallucination and delusion. The patient lacks insight to his changed behaviour. Likely diagnosis isParoniaParoniaPsychosisSchizophrenia  <response>: C i.e. Psychosis For a patient to meet the diagnostic criteria for schizophrenia, the symptoms must have been present for at least 6 monthsQ. With same symptoms if - Duration of episode of disturbance is 1 day but 1 month, then the diagnosis is Brief psychotic disorder. - Duration episode of disorder is 1 month but 6 months then the diagnosis is Schizophreniform psychotic disorder. 