Which of the following is a key feature of obsessive-compulsive disorder (OCD)?

A key feature of obsessive-compulsive disorder (OCD) is the presence of intrusive thoughts and repetitive behaviors. Individuals with OCD often experience unwanted and distressing thoughts, known as obsessions, which can lead to overwhelming anxiety. To alleviate this anxiety, they engage in compulsive behaviors or rituals, which are repetitive actions performed in response to the obsessions. This cycle of obsessions and compulsions is a defining characteristic of OCD, distinguishing it from other mental health conditions.

The other options represent symptoms more characteristic of different mental health disorders. Chronic sadness and despair are more associated with depression, avoidance of social situations is often linked to anxiety disorders such as social anxiety disorder, and sudden outbursts of anger could be indicative of various conditions but do not align with the hallmark aspects of OCD. Recognizing the specific features of OCD is crucial for proper diagnosis and treatment.