Answer:
This is an example of the importance of ruling out rival hypotheses.
Step-by-step explanation:
Dissociative identity disorder was known previously as multiple personality disorder (MPD). It is a mental disorder where the patient has at least two enduring personalities that are distinct. The patient often experiences losses of memory and they do not recall events attributed to the other personality. This is a complex condition that has no cure; it is treated with psychotherapy and hypnotherapy so the patient learns to associate with just one main personality.