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': 'Poor prognostic factor in chizophrenia is: \nSelect and explain. \nA. Acute onset, B. Family history of affective disorder, C. Middle age, D. Past history of schizophrenia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Past history of schizophrenia', 'role': 'assistant'}]