Although Mrs.Petrides usually sits passively in a motionless stupor,she sometimes repetitiously shakes her head or waves her arms.She most likely suffers from

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Mrs. Petrides exhibits symptoms of catatonia, characterized by unusual movements or immobility. This is a common symptom of schizophrenia. Dissociative identity disorder and bipolar disorder do not typically present with catatonia, and although obsessive-compulsive disorder can involve repetitive behaviors, it does not typically involve catatonic symptoms.