Polly Thinks That Her Father and Mother Have Been Replaced

Polly thinks that her father and mother have been replaced by two people who are simply acting as her father and mother. She believes that someone found people who look exactly like her parents and exchanged them. Polly's delusion is rare and is called ____.

A) Capgras's syndrome
B) dementia praecox
C) delusions of thought broadcasting
D) delusions of grandeur