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
Post traumatic stress-disorder is associated with all except: 
Select and explain. 
A. Flash back, B. Severe traumatic injury, C. Re-experiencing stressful events, D. It does't develop after 6 months of stress
D: It does't develop after 6 months of stress
Answer: D: It does't develop after 6 months of stress 
Explanation: D i.e. It does not develop after 6 months of stress