<prompt> Post traumatic stress syndrome is due to -Head injuryCardiovascular DiseaseMinor stressMajor life threatening events  <response>: 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 