Final answer:
The belief that one is the messiah despite suffering from schizophrenia is an example of delusion of grandeur.
Step-by-step explanation:
Brad's belief that he is the messiah despite suffering from schizophrenia is an example of delusion of grandeur. Delusion of grandeur is a type of delusion characterized by an exaggerated sense of self-worth, power, or identity. In this case, Brad's belief that he is the messiah is not based on reality and is symptomatic of his mental illness.