A"john doe" walked into the police station and reported that he had an unusual problem. he could not remember anything about himself: not where he lived or worked or even his name. the police took him to the local hospital where he was evaluated and found to have no physical injuries. "john doe’s" symptoms are most consistent with

a. dissociative identity disorder.
b. schizophrenic disorder.
c. dependent personality disorder.
d. dissociative amnesia.