An 18-Year-Old Man Is Brought to the Clinic Due to Recent

An 18-year-old man is brought to the clinic due to recent recurrent episodes of wandering in the street. The first episode was reported by the parents two years ago, but recently episodes occur more frequently after a street fight he had with his friend. The patient says that he spaces out easily. He says " I lose sensation to the world around me like I am dreaming, or I am watching the life of another person". He has no medical or surgical condition. Physical and neurologic examinations are normal. Mental examination shows anxious affect. Which of the following is the most likely diagnosis?

A) Absence seizures
B) Brief psychotic disorder
C) Depersonalization/derealization disorder
D) Dissociative amnesia
E) Dissociative identity disorder
F) Post-traumatic stress disorder