Dissociation is defined as

A) a sudden loss of memory or change in identity.
B) a person's conscious awareness separating from painful memories,thoughts,and feelings.
C) having two or more distinct identities.
D) a false belief.

Dissociation

A psychological experience of disconnection from one’s thoughts, feelings, memories, or sense of identity.

Conscious Awareness

The condition of being conscious of one's own being, feelings, ideas, and environment.

Painful Memories

Recollections from the past that cause emotional distress and discomfort when remembered or recalled.