Obsessive-compulsive disorder has the highest comorbidity rate with the following mental disorders of ( ). A: Generalized Anxiety Disorder (GAD) B: Major Depressive Disorder (MDD) C: Bipolar Disorder (BD) D: Schizophrenia

Anxiety disorders include panic disorder, generalized anxiety disorder and phobia disorder. Especially ( ) has a high rate of comorbidity with Bipolar Disorder. A: Panic disorder B: generalized anxiety disorder C: terror disorder D: social disorder