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': 'A patient complains that people living upstairs are always talking about him and conspires against him. His son complains about his weired behaviour like keeping shoes in Fridge and wearing vest over shi. The likely diagnosis is: \nSelect and explain. \nA. Depression, B. Delusional disorder, C. Dementia, D. Schizophrenia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Schizophrenia', 'role': 'assistant'}]