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 syndrome is due to : 
Select and explain. 
A. Head injury, B. CVD, C. Minor stress, D. Major life threatening events
D: Major life threatening events
Answer: D: Major life threatening events 
Explanation: Post - traumatic stress disorder occurs after on extreme traumatic events involving the threat of personal death or injury.