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 :
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.
Anxiety disorder
Phobia
Conversion disorder
Post traumatic stress disorder