This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Fregoli's Syndrome is? 
Select and explain. 
A. Delusion of Doubles, B. Delusion of persecution, C. Delusion of twins, D. Delusion of parasites
A: Delusion of Doubles
Answer: A: Delusion of Doubles 
Explanation: Ans. is'a'i.e., Delusion of Doubles[Ref.: Kaplan 6 Saddock IF/e Chap. I4The Fregoli delusion, or the delusion of doubles, is a rare disorder in which a person holds a delusional belief that different people are in fact a single person who changes appearance or is in disguise.