Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dual Diagnosis ?
    ### Response:
    A person with dual diagnosis has both a mental disorder and an alcohol or drug problem. These conditions occur together frequently. In particular, alcohol and drug problems tend to occur with       - Depression     - Anxiety disorders    - Schizophrenia     - Personality disorders        Sometimes the mental problem occurs first.
    