This is the only answer that comes directly from symptoms of schizophrenia. the others either come from depression or are just another type of random disorder
This type of delusion makes the person feel persecuted, stalked and spied on, as it says in the example. It is a common delusion among schizophrenic people since it is classified as a psycothic disorder, and so, people who are diagnosed with it have a hard time distinguishing between reality and their imagination. They also tend to become paranoic and experience other types of delusions and allucinations.
