A 16-year-old client diagnosed with schizophrenia is experiencing auditory command hallucinations. The client reports the voices are telling him to harm others. The client's parents ask the nurse, “Where do the voices come from?" Which is the nurse’s most appropriate reply?

“Hallucinations can be caused by medication interactions.”

“Auditory hallucinations are caused by increased dopamine levels in the brain.”

“Auditory hallucinations are mainly due to abnormal hormone changes.”

“Hallucinations occur when there is not enough serotonin in the brain.”