What term refers to the frequency with which a disorder occurs within a particular population?

Aconcordance

Bdiagnosis

Cincidence

Dprevalence

A patient suffers from altered speech and behavior, and often does not show emotion. Which type of schizophrenia exhibits these symptoms?

Acatatonic schizophrenia

Bdisorganized schizophrenia

Cparanoid schizophrenia

Dundifferentiated schizophrenia