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
[{'content': 'Delusion of doubles is found in - \nSelect and explain. \nA. Schizo affective disorder, B. Capgras syndrome, C. Reactive psychosis, D. Paranoid schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Capgras syndrome is delusional disorder, where a person believes that his family member has been kidnapped and replaced by a stranger.', 'role': 'assistant'}]