If a person's mental functioning or body feels unreal or foreign, the person is MOST likely suffering from:

A) body dysmorphic disorder.
B) depersonalization.
C) dissociative identity disorder.
D) dissociative amnesia.

Depersonalization is characterized by a feeling of detachment or estrangement from one's self, where a person might feel as though their thoughts, feelings, or body are unreal or foreign. This is distinct from body dysmorphic disorder, which involves obsessive focus on perceived flaws in physical appearance; dissociative identity disorder, which involves the presence of two or more distinct personality states; and dissociative amnesia, which involves gaps in memory for personal history.