<prompt> NOT RELATED-PSYCHIATRY Delusion is the disorder ofThoughtPerceptionAlways organicAlways psychiatric  <response>: DELUSION 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 practise and seen in many psychological disorders.Commonly seen delusions in schizophrenia are:1. Delusion of grandeur 2. Delusion of persecution 3. Delusion of reference 4.Delusion of control. 