<prompt> The diagnostic feature that differentiates PTSD from other disorders that occur following a stressful incident is :Episodic occurrence of symptomsSevere anxiety and autonomic arousalRe - experiencing and avoidance of traumaNightmares about the event  <response>: Persons with other stressful disorder may present with any of the symptoms mentioned in the options but re - experiencing the symptoms is characteristic of Post - traumatic stress disorder. 