This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anxiety disorders stress disorders and grief, Subject name: Psychiatry
Post traumatic stress syndrome is due to - 
Select and explain. 
A. Head injury, B. Cardiovascular Disease, C. Minor stress, D. Major life threatening events
D: Major life threatening events
Answer: D: Major life threatening events 
Explanation: REACTION TO STRESS AND ADJUSTMENT DISORDERS This category in ICD-10 consists of disorders which are temporally related to an exceptionally stressful life event ( acute stress reaction and post-traumatic stress disorder) or a significant life change (adjustment disorders) immediately before the onset of illness. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no.111