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
Poor prognostic factor in chizophrenia is: 
Select and explain. 
A. Acute onset, B. Family history of affective disorder, C. Middle age, D. Past history of schizophrenia
D: Past history of schizophrenia
Answer: D: Past history of schizophrenia 
Explanation: Past history of schizophrenia