This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A software engineer had financial losses. After that he went to a new place  and changed his name and started the career as a cab driver. He had no knowledge about his past life. Diagnosis: 
Select and explain. 
A. Ganser syndrome, B. Dissociative amnesia, C. Dissociative fugue, D. Dissociative identity disorder
C: Dissociative fugue
Answer: C: Dissociative fugue 
Explanation: Dissociative fugue is characterized by sudden, unexpected journey away from home to a new place and assuming a new identity with inability to recall past.