Adrian,a Graduate Student,is Learning to Use DSM-5 and Is Surprised

Multiple Choice

Adrian,a graduate student,is learning to use DSM-5 and is surprised to find that there are no official subtypes of schizophrenia given,even though he remembers seeing them in previous DSM versions.Which of the following statements is true regarding this discrepancy?

A) The previous subtypes were strong predictors of the course of the disorder.
B) Recent genetic evidence showed that the subtypes were etiologically distinct syndromes.
C) Evidence has shown that the previous subtypes were not qualitatively different disorders.
D) The subtypes were valid.