This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neurotic, Stress Related and Somatoform Disorders, Subject name: Psychiatry
[{'content': 'Which of the following factors is the most impoant predictor of development of Post-Traumatic Stress Disorder (PTSD) in a 30-year-old man who has just been involved in a road traffic accident? \nSelect and explain. \nA. Death of a friend in the accident, B. His age and gender, C. History of panic disorder, D. History of substance abuse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Severity of event or accident is the most impoant predictor for development of PTSD.', 'role': 'assistant'}]