Which of the following is NOT a type of delusion?

Delusions are false beliefs that are firmly held despite evidence to the contrary, and they are commonly classified into various types. The types mentioned in the question include grandiose delusions, somatic delusions, and paranoid delusions.

Grandiose delusions involve an individual believing they have exceptional abilities, wealth, or fame that is not based in reality. For example, a person might think they are a famous celebrity or possess special powers.

Somatic delusions pertain to false beliefs about one's body or health. An individual might believe they are suffering from a severe medical condition despite medical evidence to the contrary.

Paranoid delusions involve a strong belief that others are out to harm or conspire against the individual, often resulting in significant mistrust or fear of others.

In contrast, 'affective' does not describe a specific type of delusion in the clinical classification of delusions. Instead, it typically relates to mood disorders and illustrates how emotions can influence thought processes. Therefore, it is not categorized as a type of delusion like the other three mentioned. This makes it the correct answer to the question about which one does not fit the definition of a delusion type.