A Client Who Presents in the Psychiatric Unit Tells the Admitting

A client who presents in the psychiatric unit tells the admitting nurse that she is very depressed and is having a hard time staying clean and sober. Which of the following is true regarding mental illness in a client with identified substance abuse?

A) Depression or other mental illness is an expected outcome of substance abuse recovery.
B) Depression or other mental illnesses are symptoms of the substance abuse.
C) Depression or other mental illness should be treated only after the client has been sober for one month.
D) Depression or other untreated mental illness can contribute to relapse.