which of the following is not a common treatment for a mental illness?

The treatment that is NOT common for mental illness is surgery. Common treatments for mental illness typically include psychotherapy or counseling (such as cognitive behavioral therapy), medication, support groups, mindfulness training, exposure therapy, and other psychological therapies. Surgery is not considered a standard or common treatment for mental illnesses, as these conditions primarily involve brain chemistry, emotions, and behavior rather than physical abnormalities that require surgical intervention.