Sam believes the Queen of England is in love with him.He does not have any other symptoms.His most likely diagnosis would be

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Quizplus · Accepted Answer

Sam's belief that the Queen of England is in love with him is a fixed, non-bizarre delusion that has persisted for more than one month, which fits the criteria for delusional disorder. This diagnosis does not require the presence of other psychotic symptoms, which rules out options A and B. And although delusions can occur in bipolar disorder, the duration of Sam's symptoms (more than one month) and the lack of any other manic or depressive symptoms make bipolar disorder with delusions unlikely.

Sam Believes the Queen of England Is in Love with Him.He