Brian brushes his teeth 18 times per day. Each time, he uses exactly 50 strokes up and 50 strokes down. After he eats, he must brush twice with two different brands of toothpaste. Brian suffers from a(n): phobia generalized anxiety disorder obsessive-compulsive disorder panic disorder

Brian's tooth-brushing habit—18 times a day with an exact number of strokes—suggests an obsession with cleanliness or a fear of germs, which is characteristic of obsessive-compulsive disorder (OCD). People with OCD often perform repetitive behaviors or mental acts in response to intrusive thoughts, striving to relieve their anxiety. This condition can significantly affect their daily lives, as they may feel compelled to carry out specific routines to prevent perceived harm. In real-life settings, OCD sometimes manifests in unique and excessive rituals, like checking locks or consistently organizing items. Understanding these patterns is crucial for supportive environments, whether in friendships or workplaces. While it can seem quirky, OCD can impact individuals significantly, so empathy and knowledge about the condition are essential for helping someone who struggles.