<prompt> Delusion is the disorder of:ThoughtPerceptionAlways organicAlways psychiatric  <response>: Ans. a ThoughtDELUSION is false belief in something that is not true.Types of delusions are:1. Primary delusions autochthonous delusions: Arise denovo, cannot be explained on the basis of other experiences or perceptions. They are characteristic of early schizophrenia.2. Secondary delusions: Commonest delusions seen in clinical practice and many psychological disorders.Commonly seen delusions in schizophrenia are:1. Delusion of grandeur2. Delusion of persecution3. Delusion of reference4. Delusion of control. 