Delusion is the disorder of which of the following:

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 seen in many psychological disorders.Commonly seen delusions in schizophrenia are:1. Delusion of grandeur2. Delusion of persecution3. Delusion of reference4. Delusion of control