<prompt> Maximum benefit of electroconvulsive therapy is inHysteriaChronic schizophreniaDepression with suicidal tendencyMania  <response>: Most important and most common indication for ECT is severe depression with suicidal risk. Indications of ECT1. Severe depression with suicidal risk or with psychotic features or with stupor.2. Some types of schizophrenia catatonic or paranoid3. Schizophrenic or depressive stupor4. Severe catatonia with stupor5. Severe psychoses schizophrenia or mania with the risk of suicide or homicide or physical assault. 