This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Psychiatry
Post-traumatic stress disorder is characterized by all Except 
Select and explain. 
A. Flash back and night mare, B. Severe traumatic life event, C. Re-experiencing stressful events, D. It develops after 6 months of stress
D: It develops after 6 months of stress
Answer: D: It develops after 6 months of stress 
Explanation: Symptoms of PTSD develop within 6 months of stressor, however, 10% of patients have delayed the onset Reference: Kaplon and sadock, 11 th edition, synopsis of psychiatry, 11 th edition, pg no. 437