ADHD is primarily characterized by which symptom?

• A. Difficulty focusing one's attention on tasks.
• B. Excessive daytime sleepiness with no other symptoms.
• C. Persistent mood swings unrelated to environment.
• D. Hallucinations and delusions.

Answer: (A)

ADHD centers on trouble regulating attention. The most distinguishing feature is difficulty sustaining attention on tasks, especially those that are repetitive or require mental effort. This often shows up as getting easily distracted, making careless mistakes, not finishing tasks, and having trouble following through with instructions or organizing activities. Those attention challenges are what typically disrupt functioning at school, work, and in relationships, and they occur even when someone is motivated to do well.

Other choices describe issues not unique to ADHD. Excessive daytime sleepiness points to sleep-related problems rather than an attention-control disorder. Persistent mood swings are more aligned with mood disorders. Hallucinations and delusions are psychotic symptoms.