QUESTION 1 1. Select the neurotransmitter involved in obse ssive-compulsive disorder (OCD) in children and adolescents based on the common comorbidity of tic disorders. A Norepinephrine B GABA . C Dopamine . D Acetylcholine Answer: Dopamine Obsessive-compulsive disorder (OCD) is linked to defects in the cortico-striatal-thalamic-cortical (CSTC) circuitry, which may be linked to neurotransmitter dysregulation throughout this network. Serotonin, dopamine, glutamate, and -aminobutyric acid (GABA) are the main neurotransmitters throughout the CSTC. Compulsive behaviors linked to OCD