Rick believes that his dog is really his sister who was given up for adoption by his mother 30 years ago.Rick's belief is

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A delusion is a belief that is strongly held despite evidence to the contrary. In this case, there is no evidence that Rick's dog is actually his sister, so his belief is a delusion. It is not an illusion, which is a misperception of reality, or a hallucination, which is a perception of something that is not actually there. It is also not a faulty perception because Rick is not perceiving something incorrectly; he is simply believing something that is not true.

Rick Believes That His Dog Is Really His Sister Who