This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia and other psychotic disorders, Subject name: Psychiatry
[{'content': 'Folie-a-deux means \nSelect and explain. \nA. Delusion of persecution, B. Sharing of delusion, C. Delusion of double, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This is an uncommon delusional disorder characterised by a sharing of delusions between usually two ( folie-a-deux) or occasionally more persons ( folie-a-trios, folie-a-quatre, Folie-a-Famille), who usually have a closely knit emotional bond. Only one person usually has authentic delusions due to an underlying psychiatric disorder, most often schizophrenia or delusional disorder. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no. 85', 'role': 'assistant'}]