There are days when Vincent thinks his therapist is the very greatest person in the world who can do no wrong.Sometimes, however, he thinks and feels that the therapist is completely unable to understand or help him.On these days, Vincent will often rage at his therapist and devalue her.These extreme differences is called

A) psychosis.
B) schizophrenia.
C) splitting.
D) regression.

The extreme differences in Vincent's perception of his therapist, where he alternates between idealizing her and devaluing her, is a classic example of splitting. Splitting is a defense mechanism where a person sees the world in black and white, and their feelings towards people or situations are extreme and polarized, rather than balanced and nuanced. This is often seen in personality disorders such as borderline personality disorder. Neither A, B, or D are the best choice as they do not accurately reflect Vincent's symptoms.