Which of the following disorder does not fall under the category of Trauma- and Stressor-Related Disorders?

Separation anxiety disorder

Trauma- and Stressor-Related Disorders: Very often people who have been caught in a natural disaster (such as tsunami) or have been victims of bomb blasts by terrorists, or been in a serious accident or in a war-related situation, experience post-traumatic stress disorder (PTSD). PTSD symptoms vary widely but may include recurrent dreams, flashbacks, impaired concentration, and emotional numbing. Adjustment Disorders and Acute Stress Disorder are also included under this category.