<prompt> Transmitters mainly involved in OCN isGABANEDopamineSerotonin  <response>: D i.e. SerotoninOCN involves Serotonin 5-HT system, so fluoxetine SSRI is DOC.DiseaseRelated NeurotransmitterAlzheimersdisease- Acetyl cholineQ Nor epinephrine are hypoactive- So anticholine-esterase - TacrineQ is used in treatment.DepressionNorepinephrine, Serotonin 5-HTQ Dopamine are reducedOCNSerotonin 5 1172SchizophreniaDopamine, Serotonin Norepinephrine are ted2 