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 gets relieved but developed sadness, talks less to others, remain on 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: D i.e. He is reacting to external stimuliPost psychotic depressive disorder of schizophrenia occurs only during the residual phase of schizophrenia in 25%Differential diagnosis of post psychotic depressive disorder of schizophrenia are - Residual phase (negative symptoms) of schizophrenia- Adverse effects (eg. parkinsonism, akinesia, akathisia) of antipsychotic drugs - Schizoaffective disorder - depressive type', 'role': 'assistant'}]