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 of schizophrenia on neuroleptics, his psychotic symptoms get relieved but developed sadness, talks less to others, remain on the bed, all of following are likely causes except - \nSelect and explain. \nA. Parkinsonism, B. Major depression, C. Negative symptoms are still persisting, D. He is reacting to external stimuli', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In post-schizophrenic depression, the depressive symptoms become florid as an outcome of schizophrenic illness and not as a reaction to it. Schizophrenia resolves to a great extent but some symptoms still persist. For diagnosis, there should be a positive history of schizophrenia within the previous year. If schizophrenic symptoms are not present, a depressive episode is to be considered.\nDifferential diagnosis of post-schizophrenic depression includes residual phase (negative symptoms) of schizophrenia, Schizoaffective disorder (Depressive type), adverse effects of antipsychotics (Parkinsonism, akathisia).', 'role': 'assistant'}]