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What is A lady while driving a car meets with an accident. She was admitted in an ICU for 6 months. After being discharged she often gets up in the night and feels terrified. She is afraid to sit in a car again. The diagnosis is : and explain in detail?
Information in this question is :

A traumatic event involving the threat of life or injury (car accident).
Nightmares (gets up in the night & feels terrified).
Avoidance (afraid to sit in a car again → avoiding to sit in a car).

Diagnosis is PTSD.