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
Time interval between acute and persistent psychotic disease is ? 
Select and explain. 
A. 1 week, B. 2 week, C. 3 week, D. 1 months
D: 1 months
Answer: D: 1 months 
Explanation: Ans. is `d' i.e., 1 months If symtoms are for less than 1 months, it is transient psychotic disorder and if there are for more than 1 months, it is persistent psychotic disorder (persistent delusional disorder). Note:- Diagnosic criteria for delusional disorder (Persistent delusion disorder) has different durations in DSM IV and ICD-10 :- According to DSM IV, symptoms (Non bizzare delusion) should be for > 1 months. According to ICD-10, Symptoms should be for > 3 months.