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
Delusion of persecution occurs in - 
Select and explain. 
A. Schizophrenia, B. Paranoid psychosis, C. Manic episode, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Delusions of presecution are seen in schizophrenia (especially paranoid), severe affective disorders (Severe mania, Severe depression), and organic brain syndrome.