Ans. B. Acute Psychosis* Hearing of voices, Aggressive Behaviors, muttering to self is a sign of psychosis as it less than 1 month it is Acute Psychosis.* It is not fever induced or Delirium because in these conditions the orientation is usually impaired but is not impaired in this question.* In delusional disorder - there is a single non - Bizarre (physically impossible, logically - impossible) and other than that everything is usually normal. In this condition there is hearing of voices, Aggressive and muttering to self, which usually is not there in Delusional disorder.