Which psychological comorbidity is most commonly seen with generalized anxiety disorder?

Choice A reason: Unipolar major depressive disorder is the most frequent comorbid condition diagnosed alongside generalized anxiety disorder, with overlap rates often exceeding 60%. These two conditions share common genetic vulnerabilities and a high degree of "negative affectivity." This frequent co-occurrence often necessitates treatment strategies that address both the ruminative worry of anxiety and the low mood and anhedonia characteristic of depression. Choice B reason: Neurodevelopmental disorders, such as autism or ADHD, can certainly co-occur with anxiety, but they are not the most statistically common comorbidity. Generalized anxiety disorder is characterized by persistent, excessive worry about multiple domains, which is a different diagnostic cluster than the developmental impairments in social communication or executive function that define neurodevelopmental conditions. Choice C reason: Acute stress disorder is a time-limited reaction to a specific traumatic event, occurring within one month of exposure. While anxiety is a component of the stress response, it is a discrete, trauma-based diagnosis. Generalized anxiety disorder is a chronic condition involving "free-floating" anxiety that is not necessarily tied to a single traumatic trigger, making it less frequently comorbid than major depression. Choice D reason: Obsessive compulsive disorder was previously categorized with anxiety disorders but is now in its own DSM-5-TR chapter. While individuals with generalized anxiety disorder may have obsessive thoughts, the specific ritualized compulsions and intrusive obsessions of obsessive compulsive disorder are distinct. While comorbidity exists, it does not reach the high statistical prevalence seen with the overlap between anxiety and unipolar depression.