Which of the following could be classified as an obsession?

An obsession is characterized by persistent and intrusive thoughts, urges, or images that cause significant anxiety or distress. In this context, a fear of contamination exemplifies an obsession because it represents a recurring thought that preoccupies the mind, often leading an individual to feel anxious about germs or dirt.

In contrast, washing hands multiple times and checking locks repeatedly are examples of compulsions—behaviors performed in response to an obsession to reduce anxiety or prevent a feared event. Counting items in a specific order also indicates a compulsion, as it is a behavior aimed at achieving a specific outcome, often linked to anxiety about the necessity of order or correctness.